diff --git a/examples/passthrough.rs b/examples/passthrough.rs
index bd865c3c..a7277430 100644
--- a/examples/passthrough.rs
+++ b/examples/passthrough.rs
@@ -172,7 +172,7 @@ impl Filesystem for PassthroughFs {
         let (fh, id) = self
             .backing_cache
             .get_or(ino, || {
-                let file = File::open("/etc/os-release")?;
+                let file = File::open("/etc/profile")?;
                 reply.open_backing(file)
             })
             .unwrap();
diff --git a/examples/simple.rs b/examples/simple.rs
index 0679bfd2..eb9c7bc5 100644
--- a/examples/simple.rs
+++ b/examples/simple.rs
@@ -33,7 +33,7 @@ use std::sync::atomic::{AtomicU64, Ordering};
 use std::time::{Duration, SystemTime, UNIX_EPOCH};
 use std::{env, fs, io};
 
-const BLOCK_SIZE: u64 = 512;
+const BLOCK_SIZE: u32 = 512;
 const MAX_NAME_LENGTH: u32 = 255;
 const MAX_FILE_SIZE: u64 = 1024 * 1024 * 1024 * 1024;
 
@@ -221,7 +221,7 @@ impl From<InodeAttributes> for fuser::FileAttr {
         fuser::FileAttr {
             ino: attrs.inode,
             size: attrs.size,
-            blocks: attrs.size.div_ceil(BLOCK_SIZE),
+            blocks: attrs.size.div_ceil(u64::from(BLOCK_SIZE)),
             atime: system_time_from_time(attrs.last_accessed.0, attrs.last_accessed.1),
             mtime: system_time_from_time(attrs.last_modified.0, attrs.last_modified.1),
             ctime: system_time_from_time(
@@ -235,7 +235,7 @@ impl From<InodeAttributes> for fuser::FileAttr {
             uid: attrs.uid,
             gid: attrs.gid,
             rdev: 0,
-            blksize: BLOCK_SIZE as u32,
+            blksize: BLOCK_SIZE,
             flags: 0,
         }
     }
@@ -316,11 +316,11 @@ impl SimpleFS {
         fh
     }
 
-    fn check_file_handle_read(&self, file_handle: u64) -> bool {
+    fn check_file_handle_read(file_handle: u64) -> bool {
         (file_handle & FILE_HANDLE_READ_BIT) != 0
     }
 
-    fn check_file_handle_write(&self, file_handle: u64) -> bool {
+    fn check_file_handle_write(file_handle: u64) -> bool {
         (file_handle & FILE_HANDLE_WRITE_BIT) != 0
     }
 
@@ -340,7 +340,7 @@ impl SimpleFS {
         }
     }
 
-    fn write_directory_content(&self, inode: Inode, entries: DirectoryDescriptor) {
+    fn write_directory_content(&self, inode: Inode, entries: &DirectoryDescriptor) {
         let path = Path::new(&self.data_dir)
             .join("contents")
             .join(inode.to_string());
@@ -466,7 +466,7 @@ impl SimpleFS {
 
         let mut entries = self.get_directory_content(parent).unwrap();
         entries.insert(name.as_bytes().to_vec(), (inode, kind));
-        self.write_directory_content(parent, entries);
+        self.write_directory_content(parent, &entries);
 
         Ok(())
     }
@@ -502,7 +502,7 @@ impl Filesystem for SimpleFS {
             self.write_inode(&root);
             let mut entries = BTreeMap::new();
             entries.insert(b".".to_vec(), (FUSE_ROOT_ID, FileKind::Directory));
-            self.write_directory_content(FUSE_ROOT_ID, entries);
+            self.write_directory_content(FUSE_ROOT_ID, &entries);
         }
         Ok(())
     }
@@ -653,7 +653,7 @@ impl Filesystem for SimpleFS {
                 // This is important as it preserves the semantic that a file handle opened
                 // with W_OK will never fail to truncate, even if the file has been subsequently
                 // chmod'ed
-                if self.check_file_handle_write(handle) {
+                if Self::check_file_handle_write(handle) {
                     if let Err(error_code) = self.truncate(inode, size, 0, 0) {
                         reply.error(error_code);
                         return;
@@ -840,12 +840,12 @@ impl Filesystem for SimpleFS {
             let mut entries = BTreeMap::new();
             entries.insert(b".".to_vec(), (inode, FileKind::Directory));
             entries.insert(b"..".to_vec(), (parent, FileKind::Directory));
-            self.write_directory_content(inode, entries);
+            self.write_directory_content(inode, &entries);
         }
 
         let mut entries = self.get_directory_content(parent).unwrap();
         entries.insert(name.as_bytes().to_vec(), (inode, attrs.kind));
-        self.write_directory_content(parent, entries);
+        self.write_directory_content(parent, &entries);
 
         // TODO: implement flags
         reply.entry(&Duration::new(0, 0), &attrs.into(), 0);
@@ -900,7 +900,7 @@ impl Filesystem for SimpleFS {
         let attrs = InodeAttributes {
             inode,
             open_file_handles: 0,
-            size: BLOCK_SIZE,
+            size: u64::from(BLOCK_SIZE),
             last_accessed: time_now(),
             last_modified: time_now(),
             last_metadata_changed: time_now(),
@@ -916,11 +916,11 @@ impl Filesystem for SimpleFS {
         let mut entries = BTreeMap::new();
         entries.insert(b".".to_vec(), (inode, FileKind::Directory));
         entries.insert(b"..".to_vec(), (parent, FileKind::Directory));
-        self.write_directory_content(inode, entries);
+        self.write_directory_content(inode, &entries);
 
         let mut entries = self.get_directory_content(parent).unwrap();
         entries.insert(name.as_bytes().to_vec(), (inode, FileKind::Directory));
-        self.write_directory_content(parent, entries);
+        self.write_directory_content(parent, &entries);
 
         reply.entry(&Duration::new(0, 0), &attrs.into(), 0);
     }
@@ -977,7 +977,7 @@ impl Filesystem for SimpleFS {
 
         let mut entries = self.get_directory_content(parent).unwrap();
         entries.remove(name.as_bytes());
-        self.write_directory_content(parent, entries);
+        self.write_directory_content(parent, &entries);
 
         reply.ok();
     }
@@ -1038,7 +1038,7 @@ impl Filesystem for SimpleFS {
 
         let mut entries = self.get_directory_content(parent).unwrap();
         entries.remove(name.as_bytes());
-        self.write_directory_content(parent, entries);
+        self.write_directory_content(parent, &entries);
 
         reply.ok();
     }
@@ -1210,14 +1210,14 @@ impl Filesystem for SimpleFS {
                 new_name.as_bytes().to_vec(),
                 (inode_attrs.inode, inode_attrs.kind),
             );
-            self.write_directory_content(new_parent, entries);
+            self.write_directory_content(new_parent, &entries);
 
             let mut entries = self.get_directory_content(parent).unwrap();
             entries.insert(
                 name.as_bytes().to_vec(),
                 (new_inode_attrs.inode, new_inode_attrs.kind),
             );
-            self.write_directory_content(parent, entries);
+            self.write_directory_content(parent, &entries);
 
             parent_attrs.last_metadata_changed = time_now();
             parent_attrs.last_modified = time_now();
@@ -1233,12 +1233,12 @@ impl Filesystem for SimpleFS {
             if inode_attrs.kind == FileKind::Directory {
                 let mut entries = self.get_directory_content(inode_attrs.inode).unwrap();
                 entries.insert(b"..".to_vec(), (new_parent, FileKind::Directory));
-                self.write_directory_content(inode_attrs.inode, entries);
+                self.write_directory_content(inode_attrs.inode, &entries);
             }
             if new_inode_attrs.kind == FileKind::Directory {
                 let mut entries = self.get_directory_content(new_inode_attrs.inode).unwrap();
                 entries.insert(b"..".to_vec(), (parent, FileKind::Directory));
-                self.write_directory_content(new_inode_attrs.inode, entries);
+                self.write_directory_content(new_inode_attrs.inode, &entries);
             }
 
             reply.ok();
@@ -1280,7 +1280,7 @@ impl Filesystem for SimpleFS {
         if let Ok(mut existing_inode_attrs) = self.lookup_name(new_parent, new_name) {
             let mut entries = self.get_directory_content(new_parent).unwrap();
             entries.remove(new_name.as_bytes());
-            self.write_directory_content(new_parent, entries);
+            self.write_directory_content(new_parent, &entries);
 
             if existing_inode_attrs.kind == FileKind::Directory {
                 existing_inode_attrs.hardlinks = 0;
@@ -1294,14 +1294,14 @@ impl Filesystem for SimpleFS {
 
         let mut entries = self.get_directory_content(parent).unwrap();
         entries.remove(name.as_bytes());
-        self.write_directory_content(parent, entries);
+        self.write_directory_content(parent, &entries);
 
         let mut entries = self.get_directory_content(new_parent).unwrap();
         entries.insert(
             new_name.as_bytes().to_vec(),
             (inode_attrs.inode, inode_attrs.kind),
         );
-        self.write_directory_content(new_parent, entries);
+        self.write_directory_content(new_parent, &entries);
 
         parent_attrs.last_metadata_changed = time_now();
         parent_attrs.last_modified = time_now();
@@ -1315,7 +1315,7 @@ impl Filesystem for SimpleFS {
         if inode_attrs.kind == FileKind::Directory {
             let mut entries = self.get_directory_content(inode_attrs.inode).unwrap();
             entries.insert(b"..".to_vec(), (new_parent, FileKind::Directory));
-            self.write_directory_content(inode_attrs.inode, entries);
+            self.write_directory_content(inode_attrs.inode, &entries);
         }
 
         reply.ok();
@@ -1408,7 +1408,7 @@ impl Filesystem for SimpleFS {
     ) {
         debug!("read() called on {inode:?} offset={offset:?} size={size:?}");
         assert!(offset >= 0);
-        if !self.check_file_handle_read(fh) {
+        if !Self::check_file_handle_read(fh) {
             reply.error(libc::EACCES);
             return;
         }
@@ -1444,7 +1444,7 @@ impl Filesystem for SimpleFS {
     ) {
         debug!("write() called with {:?} size={:?}", inode, data.len());
         assert!(offset >= 0);
-        if !self.check_file_handle_write(fh) {
+        if !Self::check_file_handle_write(fh) {
             reply.error(libc::EACCES);
             return;
         }
@@ -1596,9 +1596,9 @@ impl Filesystem for SimpleFS {
             10_000,
             1,
             10_000,
-            BLOCK_SIZE as u32,
+            BLOCK_SIZE,
             MAX_NAME_LENGTH,
-            BLOCK_SIZE as u32,
+            BLOCK_SIZE,
         );
     }
 
@@ -1805,12 +1805,12 @@ impl Filesystem for SimpleFS {
             let mut entries = BTreeMap::new();
             entries.insert(b".".to_vec(), (inode, FileKind::Directory));
             entries.insert(b"..".to_vec(), (parent, FileKind::Directory));
-            self.write_directory_content(inode, entries);
+            self.write_directory_content(inode, &entries);
         }
 
         let mut entries = self.get_directory_content(parent).unwrap();
         entries.insert(name.as_bytes().to_vec(), (inode, attrs.kind));
-        self.write_directory_content(parent, entries);
+        self.write_directory_content(parent, &entries);
 
         // TODO: implement flags
         reply.created(
@@ -1872,11 +1872,11 @@ impl Filesystem for SimpleFS {
         debug!(
             "copy_file_range() called with src=({src_fh}, {src_inode}, {src_offset}) dest=({dest_fh}, {dest_inode}, {dest_offset}) size={size}"
         );
-        if !self.check_file_handle_read(src_fh) {
+        if !Self::check_file_handle_read(src_fh) {
             reply.error(libc::EACCES);
             return;
         }
-        if !self.check_file_handle_write(dest_fh) {
+        if !Self::check_file_handle_write(dest_fh) {
             reply.error(libc::EACCES);
             return;
         }
diff --git a/src/ll/mod.rs b/src/ll/mod.rs
index 6545288b..624b01c2 100644
--- a/src/ll/mod.rs
+++ b/src/ll/mod.rs
@@ -4,7 +4,7 @@ mod argument;
 pub mod fuse_abi;
 pub(crate) mod notify;
 pub(crate) mod reply;
-mod request;
+pub(crate) mod request;
 
 use std::{convert::TryInto, num::NonZeroI32, time::SystemTime};
 
diff --git a/src/ll/reply.rs b/src/ll/reply.rs
index c8e95f83..204fa34f 100644
--- a/src/ll/reply.rs
+++ b/src/ll/reply.rs
@@ -247,7 +247,7 @@ impl<'a> Response<'a> {
         Self::from_struct(&r)
     }
 
-    fn new_directory(list: EntListBuf) -> Self {
+    pub(crate) fn new_directory(list: EntListBuf) -> Self {
         assert!(list.buf.len() <= list.max_size);
         Self::Data(list.buf)
     }
@@ -262,7 +262,7 @@ impl<'a> Response<'a> {
         Self::from_struct(&r)
     }
 
-    fn from_struct<T: IntoBytes + Immutable + ?Sized>(data: &T) -> Self {
+    pub(crate) fn from_struct<T: IntoBytes + Immutable + ?Sized>(data: &T) -> Self {
         Self::Data(SmallVec::from_slice(data.as_bytes()))
     }
 }
@@ -349,12 +349,13 @@ impl From<crate::FileAttr> for Attr {
 }
 
 #[derive(Debug)]
-struct EntListBuf {
+/// A generic data buffer
+pub(crate) struct EntListBuf {
     max_size: usize,
     buf: ResponseBuf,
 }
 impl EntListBuf {
-    fn new(max_size: usize) -> Self {
+    pub(crate) fn new(max_size: usize) -> Self {
         Self {
             max_size,
             buf: ResponseBuf::new(),
@@ -365,7 +366,7 @@ impl EntListBuf {
     /// A transparent offset value can be provided for each entry. The kernel uses these
     /// value to request the next entries in further readdir calls
     #[must_use]
-    fn push(&mut self, ent: [&[u8]; 2]) -> bool {
+    pub(crate) fn push(&mut self, ent: [&[u8]; 2]) -> bool {
         let entlen = ent[0].len() + ent[1].len();
         let entsize = (entlen + size_of::<u64>() - 1) & !(size_of::<u64>() - 1); // 64bit align
         if self.buf.len() + entsize > self.max_size {
diff --git a/src/passthrough.rs b/src/passthrough.rs
index 6376d5ff..24b283c0 100644
--- a/src/passthrough.rs
+++ b/src/passthrough.rs
@@ -45,7 +45,7 @@ nix::ioctl_write_ptr!(
 /// make that call (if the channel hasn't already been closed).
 #[derive(Debug)]
 pub struct BackingId {
-    channel: Weak<File>,
+    pub(crate) channel: Weak<File>,
     /// The `backing_id` field passed to and from the kernel
     pub(crate) backing_id: u32,
 }
diff --git a/tests/test_passthrough.sh b/tests/test_passthrough.sh
index 0224af33..111be92b 100755
--- a/tests/test_passthrough.sh
+++ b/tests/test_passthrough.sh
@@ -34,7 +34,7 @@ for x in $(seq 10); do
     sleep 1
 done
 
-expected="$(sha256sum - < /usr/lib/os-release)"
+expected="$(sha256sum - < /etc/profile)"
 
 # Check that it's equal to the underlying file
 test "$(sha256sum - < "${mnt}/passthrough")" = "${expected}"