diff --git a/src/diskio/immediate.rs b/src/diskio/immediate.rs
index 6cc096f795..24d30f5e9c 100644
--- a/src/diskio/immediate.rs
+++ b/src/diskio/immediate.rs
@@ -14,7 +14,7 @@ use std::{
 use super::{CompletedIo, Executor, FileBuffer, Item};
 
 #[derive(Debug)]
-pub struct _IncrementalFileState {
+pub(crate) struct _IncrementalFileState {
     completed_chunks: Vec<usize>,
     err: Option<io::Result<()>>,
     item: Option<Item>,
@@ -24,12 +24,12 @@ pub struct _IncrementalFileState {
 pub(super) type IncrementalFileState = Arc<Mutex<Option<_IncrementalFileState>>>;
 
 #[derive(Default, Debug)]
-pub struct ImmediateUnpacker {
+pub(crate) struct ImmediateUnpacker {
     incremental_state: IncrementalFileState,
 }
 
 impl ImmediateUnpacker {
-    pub fn new() -> Self {
+    pub(crate) fn new() -> Self {
         Self {
             ..Default::default()
         }
@@ -148,7 +148,7 @@ pub(super) struct IncrementalFileWriter {
 
 impl IncrementalFileWriter {
     #[allow(unused_variables)]
-    pub fn new<P: AsRef<Path>>(
+    pub(crate) fn new<P: AsRef<Path>>(
         path: P,
         mode: u32,
         state: IncrementalFileState,
@@ -172,7 +172,7 @@ impl IncrementalFileWriter {
         })
     }
 
-    pub fn chunk_submit(&mut self, chunk: FileBuffer) -> bool {
+    pub(crate) fn chunk_submit(&mut self, chunk: FileBuffer) -> bool {
         if (self.state.lock().unwrap()).is_none() {
             return false;
         }
diff --git a/src/diskio/mod.rs b/src/diskio/mod.rs
index ca6f59c825..ccd5b1cd7e 100644
--- a/src/diskio/mod.rs
+++ b/src/diskio/mod.rs
@@ -51,10 +51,10 @@
 //    loss or errors in this model.
 // f) data gathering: record (name, bytes, start, duration)
 //    write to disk afterwards as a csv file?
-pub mod immediate;
+pub(crate) mod immediate;
 #[cfg(test)]
 mod test;
-pub mod threaded;
+pub(crate) mod threaded;
 
 use std::io::{self, Write};
 use std::ops::{Deref, DerefMut};
@@ -71,7 +71,7 @@ use threaded::PoolReference;
 
 /// Carries the implementation specific data for complete file transfers into the executor.
 #[derive(Debug)]
-pub enum FileBuffer {
+pub(crate) enum FileBuffer {
     Immediate(Vec<u8>),
     // A reference to the object in the pool, and a handle to write to it
     Threaded(PoolReference),
@@ -131,7 +131,7 @@ pub(crate) const IO_CHUNK_SIZE: usize = 16_777_216;
 
 /// Carries the implementation specific channel data into the executor.
 #[derive(Debug)]
-pub enum IncrementalFile {
+pub(crate) enum IncrementalFile {
     ImmediateReceiver,
     ThreadedReceiver(Receiver<FileBuffer>),
 }
@@ -176,7 +176,7 @@ pub enum IncrementalFile {
 
 /// What kind of IO operation to perform
 #[derive(Debug)]
-pub enum Kind {
+pub(crate) enum Kind {
     Directory,
     File(FileBuffer),
     IncrementalFile(IncrementalFile),
@@ -184,25 +184,25 @@ pub enum Kind {
 
 /// The details of the IO operation
 #[derive(Debug)]
-pub struct Item {
+pub(crate) struct Item {
     /// The path to operate on
-    pub full_path: PathBuf,
+    pub(crate) full_path: PathBuf,
     /// The operation to perform
-    pub kind: Kind,
+    pub(crate) kind: Kind,
     /// When the operation started
-    pub start: Option<Instant>,
+    start: Option<Instant>,
     /// Amount of time the operation took to finish
-    pub finish: Option<Duration>,
+    finish: Option<Duration>,
     /// The length of the file, for files (for stats)
-    pub size: Option<usize>,
+    size: Option<usize>,
     /// The result of the operation (could now be factored into CompletedIO...)
-    pub result: io::Result<()>,
+    pub(crate) result: io::Result<()>,
     /// The mode to apply
-    pub mode: u32,
+    mode: u32,
 }
 
 #[derive(Debug)]
-pub enum CompletedIo {
+pub(crate) enum CompletedIo {
     /// A submitted Item has completed
     Item(Item),
     /// An IncrementalFile has completed a single chunk
@@ -210,7 +210,7 @@ pub enum CompletedIo {
 }
 
 impl Item {
-    pub fn make_dir(full_path: PathBuf, mode: u32) -> Self {
+    pub(crate) fn make_dir(full_path: PathBuf, mode: u32) -> Self {
         Self {
             full_path,
             kind: Kind::Directory,
@@ -222,7 +222,7 @@ impl Item {
         }
     }
 
-    pub fn write_file(full_path: PathBuf, mode: u32, content: FileBuffer) -> Self {
+    pub(crate) fn write_file(full_path: PathBuf, mode: u32, content: FileBuffer) -> Self {
         let len = content.len();
         Self {
             full_path,
@@ -235,7 +235,7 @@ impl Item {
         }
     }
 
-    pub fn write_file_segmented<'a>(
+    pub(crate) fn write_file_segmented<'a>(
         full_path: PathBuf,
         mode: u32,
         state: IncrementalFileState,
@@ -261,7 +261,7 @@ impl Item {
 /// just allows the immediate codepath to get access to the Arc referenced state
 /// without holding a lifetime reference to the executor, as the threaded code
 /// path is all message passing.
-pub enum IncrementalFileState {
+pub(crate) enum IncrementalFileState {
     Threaded,
     Immediate(immediate::IncrementalFileState),
 }
@@ -294,7 +294,7 @@ impl IncrementalFileState {
 /// Trait object for performing IO. At this point the overhead
 /// of trait invocation is not a bottleneck, but if it becomes
 /// one we could consider an enum variant based approach instead.
-pub trait Executor {
+pub(crate) trait Executor {
     /// Perform a single operation.
     /// During overload situations previously queued items may
     /// need to be completed before the item is accepted:
@@ -332,7 +332,7 @@ pub trait Executor {
 
 /// Trivial single threaded IO to be used from executors.
 /// (Crazy sophisticated ones can obviously ignore this)
-pub fn perform<F: Fn(usize)>(item: &mut Item, chunk_complete_callback: F) {
+pub(crate) fn perform<F: Fn(usize)>(item: &mut Item, chunk_complete_callback: F) {
     // directories: make them, TODO: register with the dir existence cache.
     // Files, write them.
     item.result = match &mut item.kind {
@@ -361,7 +361,7 @@ pub fn perform<F: Fn(usize)>(item: &mut Item, chunk_complete_callback: F) {
 }
 
 #[allow(unused_variables)]
-pub fn write_file<P: AsRef<Path>, C: AsRef<[u8]>>(
+pub(crate) fn write_file<P: AsRef<Path>, C: AsRef<[u8]>>(
     path: P,
     contents: C,
     mode: u32,
@@ -392,7 +392,7 @@ pub fn write_file<P: AsRef<Path>, C: AsRef<[u8]>>(
 }
 
 #[allow(unused_variables)]
-pub fn write_file_incremental<P: AsRef<Path>, F: Fn(usize)>(
+pub(crate) fn write_file_incremental<P: AsRef<Path>, F: Fn(usize)>(
     path: P,
     content_callback: &mut IncrementalFile,
     mode: u32,
@@ -437,7 +437,7 @@ pub fn write_file_incremental<P: AsRef<Path>, F: Fn(usize)>(
     Ok(())
 }
 
-pub fn create_dir<P: AsRef<Path>>(path: P) -> io::Result<()> {
+pub(crate) fn create_dir<P: AsRef<Path>>(path: P) -> io::Result<()> {
     let path = path.as_ref();
     let path_display = format!("{}", path.display());
     trace_scoped!("create_dir", "name": path_display);
@@ -445,7 +445,7 @@ pub fn create_dir<P: AsRef<Path>>(path: P) -> io::Result<()> {
 }
 
 /// Get the executor for disk IO.
-pub fn get_executor<'a>(
+pub(crate) fn get_executor<'a>(
     notify_handler: Option<&'a dyn Fn(Notification<'_>)>,
     ram_budget: usize,
 ) -> Result<Box<dyn Executor + 'a>> {
diff --git a/src/diskio/threaded.rs b/src/diskio/threaded.rs
index efc4dc3076..429d0f2b1d 100644
--- a/src/diskio/threaded.rs
+++ b/src/diskio/threaded.rs
@@ -18,7 +18,7 @@ use crate::utils::notifications::Notification;
 use crate::utils::units::Unit;
 
 #[derive(Copy, Clone, Debug, Enum)]
-pub enum Bucket {
+pub(crate) enum Bucket {
     FourK,
     EightK,
     OneM,
@@ -27,13 +27,13 @@ pub enum Bucket {
 }
 
 #[derive(Debug)]
-pub enum PoolReference {
+pub(crate) enum PoolReference {
     Owned(OwnedRef<Vec<u8>>, Arc<sharded_slab::Pool<Vec<u8>>>),
     Mut(OwnedRefMut<Vec<u8>>, Arc<sharded_slab::Pool<Vec<u8>>>),
 }
 
 impl PoolReference {
-    pub fn clear(&mut self) {
+    pub(crate) fn clear(&mut self) {
         match self {
             PoolReference::Mut(orm, pool) => {
                 pool.clear(orm.key());
@@ -96,7 +96,7 @@ impl fmt::Debug for Pool {
     }
 }
 
-pub struct Threaded<'a> {
+pub(crate) struct Threaded<'a> {
     n_files: Arc<AtomicUsize>,
     pool: threadpool::ThreadPool,
     notify_handler: Option<&'a dyn Fn(Notification<'_>)>,
@@ -108,7 +108,7 @@ pub struct Threaded<'a> {
 
 impl<'a> Threaded<'a> {
     /// Construct a new Threaded executor.
-    pub fn new(
+    pub(crate) fn new(
         notify_handler: Option<&'a dyn Fn(Notification<'_>)>,
         thread_count: usize,
         ram_budget: usize,