diff --git a/vendor/fuser/README.md b/vendor/fuser/README.md
index f7b2b3b52..3807c7201 100644
--- a/vendor/fuser/README.md
+++ b/vendor/fuser/README.md
@@ -1,5 +1,20 @@
+## Fork of fuser for Mountpoint
+
 This is a fork of the excellent [`fuser`](https://github.com/cberner/fuser) Rust crate for FUSE bindings, with some Mountpoint-specific changes to improve performance of concurrent operations. We'll be working to upstream these changes soon.
 
+### Fork Maintenance
+
+This fork should be maintained in the `fuser/fork` branch of the [awslabs/mountpoint-s3 repository on GitHub](https://github.com/awslabs/mountpoint-s3/tree/main/vendor/fuser).
+
+To pull in new changes from upstream, you should fetch and rebase the changes locally and then force push to the `fuser/fork` branch (- not ideal!).
+Once the `fuser/fork` branch is as desired, create a new branch from Mountpoint's `main` branch.
+Run the [`vendor-fuser.sh` script](https://github.com/awslabs/mountpoint-s3/blob/main/vendor-fuser.sh).
+You should open a pull request with the new commit created by the script.
+This pull request is where the changes are reviewed.
+
+If you wish to add new divergent changes to this fork of Fuser,
+open a pull request on the Mountpoint repository branching from the `fuser/fork` branch and use `fuser/fork` as the base branch when creating the pull request.
+
 ---
 
 # FUSE (Filesystem in Userspace) for Rust
diff --git a/vendor/fuser/build.rs b/vendor/fuser/build.rs
index 328ce5ad4..92ffe7fbf 100644
--- a/vendor/fuser/build.rs
+++ b/vendor/fuser/build.rs
@@ -1,18 +1,25 @@
 fn main() {
+    // Register rustc cfg for switching between mount implementations.
+    // When fuser MSRV is updated to v1.77 or above, we should switch from 'cargo:' to 'cargo::' syntax.
+    println!("cargo:rustc-check-cfg=cfg(fuser_mount_impl, values(\"pure-rust\", \"libfuse2\", \"libfuse3\"))");
+
     #[cfg(all(not(feature = "libfuse"), not(target_os = "linux")))]
     unimplemented!("Building without libfuse is only supported on Linux");
 
+    #[cfg(not(feature = "libfuse"))]
+    {
+        println!("cargo:rustc-cfg=fuser_mount_impl=\"pure-rust\"");
+    }
     #[cfg(feature = "libfuse")]
     {
-        #[cfg(target_os = "macos")]
-        {
+        if cfg!(target_os = "macos") {
             if pkg_config::Config::new()
                 .atleast_version("2.6.0")
                 .probe("fuse") // for macFUSE 4.x
                 .map_err(|e| eprintln!("{}", e))
                 .is_ok()
             {
-                println!("cargo:rustc-cfg=feature=\"libfuse2\"");
+                println!("cargo:rustc-cfg=fuser_mount_impl=\"libfuse2\"");
                 println!("cargo:rustc-cfg=feature=\"macfuse-4-compat\"");
             } else {
                 pkg_config::Config::new()
@@ -20,11 +27,9 @@ fn main() {
                     .probe("osxfuse") // for osxfuse 3.x
                     .map_err(|e| eprintln!("{}", e))
                     .unwrap();
-                println!("cargo:rustc-cfg=feature=\"libfuse2\"");
+                println!("cargo:rustc-cfg=fuser_mount_impl=\"libfuse2\"");
             }
-        }
-        #[cfg(not(target_os = "macos"))]
-        {
+        } else {
             // First try to link with libfuse3
             if pkg_config::Config::new()
                 .atleast_version("3.0.0")
@@ -32,7 +37,7 @@ fn main() {
                 .map_err(|e| eprintln!("{e}"))
                 .is_ok()
             {
-                println!("cargo:rustc-cfg=feature=\"libfuse3\"");
+                println!("cargo:rustc-cfg=fuser_mount_impl=\"libfuse3\"");
             } else {
                 // Fallback to libfuse
                 pkg_config::Config::new()
@@ -40,7 +45,7 @@ fn main() {
                     .probe("fuse")
                     .map_err(|e| eprintln!("{e}"))
                     .unwrap();
-                println!("cargo:rustc-cfg=feature=\"libfuse2\"");
+                println!("cargo:rustc-cfg=fuser_mount_impl=\"libfuse2\"");
             }
         }
     }
diff --git a/vendor/fuser/src/lib.rs b/vendor/fuser/src/lib.rs
index 9005973ad..09ca12ba7 100644
--- a/vendor/fuser/src/lib.rs
+++ b/vendor/fuser/src/lib.rs
@@ -26,7 +26,7 @@ use crate::mnt::mount_options::check_option_conflicts;
 use crate::session::MAX_WRITE_SIZE;
 #[cfg(feature = "abi-7-16")]
 pub use ll::fuse_abi::fuse_forget_one;
-pub use mnt::mount_options::MountOption;
+pub use mnt::{Mount, mount_options::MountOption};
 #[cfg(feature = "abi-7-11")]
 pub use notify::{Notifier, PollHandle};
 #[cfg(feature = "abi-7-11")]
diff --git a/vendor/fuser/src/ll/mod.rs b/vendor/fuser/src/ll/mod.rs
index 21b6a515e..860d0283a 100644
--- a/vendor/fuser/src/ll/mod.rs
+++ b/vendor/fuser/src/ll/mod.rs
@@ -10,9 +10,7 @@ mod request;
 use std::{convert::TryInto, num::NonZeroI32, time::SystemTime};
 
 pub use reply::Response;
-pub use request::{
-    AnyRequest, FileHandle, INodeNo, Lock, Operation, Request, RequestError, RequestId, Version,
-};
+pub use request::{AnyRequest, FileHandle, INodeNo, Lock, Operation, Request, RequestId, Version};
 
 #[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
 /// Possible input arguments for atime & mtime, which can either be set to a specified time,
diff --git a/vendor/fuser/src/ll/notify.rs b/vendor/fuser/src/ll/notify.rs
index 4a9a40902..668739b79 100644
--- a/vendor/fuser/src/ll/notify.rs
+++ b/vendor/fuser/src/ll/notify.rs
@@ -17,6 +17,7 @@ pub(crate) enum Notification<'a> {
     Bare(NotificationBuf),
 
     /// For notifications that include a buffer of arbitrary data
+    #[allow(dead_code)]
     WithData(NotificationBuf, &'a [u8]),
 
     /// For notifications that include a NUL-terminated name
@@ -122,6 +123,7 @@ impl<'a> Notification<'a> {
         Self::WithName(buf.as_bytes().into(), name)
     }
 
+    #[allow(dead_code)]
     fn from_struct_with_data<T: IntoBytes + Immutable + ?Sized>(buf: &T, data: &'a [u8]) -> Self {
         Self::WithData(buf.as_bytes().into(), data)
     }
diff --git a/vendor/fuser/src/ll/request.rs b/vendor/fuser/src/ll/request.rs
index 4c3274e3d..b65b01b3b 100644
--- a/vendor/fuser/src/ll/request.rs
+++ b/vendor/fuser/src/ll/request.rs
@@ -874,6 +874,7 @@ mod op {
         GetSize(GetXAttrSize),
         /// User is requesting the data stored in the XAttr.  If the data will fit
         /// in this number of bytes it should be returned, otherwise return [Err(Errno::ERANGE)].
+        #[allow(dead_code)]
         Size(NonZeroU32),
     }
     impl<'a> GetXAttr<'a> {
@@ -1517,6 +1518,7 @@ mod op {
     }
 
     /// Copy the specified range from the source inode to the destination inode
+    #[cfg(feature = "abi-7-28")]
     #[derive(Debug, Clone, Copy)]
     pub struct CopyFileRangeFile {
         pub inode: INodeNo,
@@ -1885,6 +1887,7 @@ pub enum Operation<'a> {
     Forget(Forget<'a>),
     GetAttr(GetAttr<'a>),
     SetAttr(SetAttr<'a>),
+    #[allow(dead_code)]
     ReadLink(ReadLink<'a>),
     SymLink(SymLink<'a>),
     MkNod(MkNod<'a>),
@@ -1896,6 +1899,7 @@ pub enum Operation<'a> {
     Open(Open<'a>),
     Read(Read<'a>),
     Write(Write<'a>),
+    #[allow(dead_code)]
     StatFs(StatFs<'a>),
     Release(Release<'a>),
     FSync(FSync<'a>),
@@ -1922,6 +1926,7 @@ pub enum Operation<'a> {
     #[cfg(feature = "abi-7-11")]
     Poll(Poll<'a>),
     #[cfg(feature = "abi-7-15")]
+    #[allow(dead_code)]
     NotifyReply(NotifyReply<'a>),
     #[cfg(feature = "abi-7-16")]
     BatchForget(BatchForget<'a>),
@@ -1944,6 +1949,7 @@ pub enum Operation<'a> {
     Exchange(Exchange<'a>),
 
     #[cfg(feature = "abi-7-12")]
+    #[allow(dead_code)]
     CuseInit(CuseInit<'a>),
 }
 
diff --git a/vendor/fuser/src/mnt/fuse2.rs b/vendor/fuser/src/mnt/fuse2.rs
index 6f3e391e3..ccdf0d819 100644
--- a/vendor/fuser/src/mnt/fuse2.rs
+++ b/vendor/fuser/src/mnt/fuse2.rs
@@ -18,11 +18,17 @@ fn ensure_last_os_error() -> io::Error {
     }
 }
 
+/// An active FUSE mount.
+///
+/// This struct manages the lifecycle of the mount, unmounting when dropped.
 #[derive(Debug)]
 pub struct Mount {
     mountpoint: CString,
 }
 impl Mount {
+    /// Mounts the filesystem at the given path, with the given options.
+    ///
+    /// Returns the mounted FUSE file descriptor along with a [Mount] for handling the mount lifecycle.
     pub fn new(mountpoint: &Path, options: &[MountOption]) -> io::Result<(Arc<File>, Mount)> {
         let mountpoint = CString::new(mountpoint.as_os_str().as_bytes()).unwrap();
         with_fuse_args(options, |args| {
@@ -55,7 +61,6 @@ impl Drop for Mount {
                     target_os = "freebsd",
                     target_os = "dragonfly",
                     target_os = "openbsd",
-                    target_os = "bitrig",
                     target_os = "netbsd"
                 )))]
                 unsafe {
diff --git a/vendor/fuser/src/mnt/fuse2_sys.rs b/vendor/fuser/src/mnt/fuse2_sys.rs
index d99597c9d..406bcbd99 100644
--- a/vendor/fuser/src/mnt/fuse2_sys.rs
+++ b/vendor/fuser/src/mnt/fuse2_sys.rs
@@ -16,7 +16,7 @@ pub struct fuse_args {
     pub allocated: c_int,
 }
 
-#[cfg(feature = "libfuse2")]
+#[cfg(fuser_mount_impl = "libfuse2")]
 extern "C" {
     // *_compat25 functions were introduced in FUSE 2.6 when function signatures changed.
     // Therefore, the minimum version requirement for *_compat25 functions is libfuse-2.6.0.
@@ -27,7 +27,6 @@ extern "C" {
         target_os = "freebsd",
         target_os = "dragonfly",
         target_os = "openbsd",
-        target_os = "bitrig",
         target_os = "netbsd"
     )))]
     pub fn fuse_unmount_compat22(mountpoint: *const c_char);
diff --git a/vendor/fuser/src/mnt/fuse3.rs b/vendor/fuser/src/mnt/fuse3.rs
index b7942b54a..c1ef1f4e8 100644
--- a/vendor/fuser/src/mnt/fuse3.rs
+++ b/vendor/fuser/src/mnt/fuse3.rs
@@ -22,11 +22,17 @@ fn ensure_last_os_error() -> io::Error {
     }
 }
 
+/// An active FUSE mount.
+///
+/// This struct manages the lifecycle of the mount, unmounting and destroying the session when dropped.
 #[derive(Debug)]
 pub struct Mount {
     fuse_session: *mut c_void,
 }
 impl Mount {
+    /// Mounts the filesystem at the given path, with the given options.
+    ///
+    /// Returns the mounted FUSE file descriptor along with a [Mount] for handling the mount lifecycle.
     pub fn new(mnt: &Path, options: &[MountOption]) -> io::Result<(Arc<File>, Mount)> {
         let mnt = CString::new(mnt.as_os_str().as_bytes()).unwrap();
         with_fuse_args(options, |args| {
diff --git a/vendor/fuser/src/mnt/fuse_pure.rs b/vendor/fuser/src/mnt/fuse_pure.rs
index e03a5585c..73c497740 100644
--- a/vendor/fuser/src/mnt/fuse_pure.rs
+++ b/vendor/fuser/src/mnt/fuse_pure.rs
@@ -178,7 +178,6 @@ fn receive_fusermount_message(socket: &UnixStream) -> Result<File, Error> {
         target_os = "freebsd",
         target_os = "dragonfly",
         target_os = "openbsd",
-        target_os = "bitrig",
         target_os = "netbsd"
     ))]
     {
diff --git a/vendor/fuser/src/mnt/mod.rs b/vendor/fuser/src/mnt/mod.rs
index 79d283cca..ee8001cd0 100644
--- a/vendor/fuser/src/mnt/mod.rs
+++ b/vendor/fuser/src/mnt/mod.rs
@@ -2,24 +2,24 @@
 //!
 //! Raw communication channel to the FUSE kernel driver.
 
-#[cfg(feature = "libfuse2")]
+#[cfg(fuser_mount_impl = "libfuse2")]
 mod fuse2;
 #[cfg(any(feature = "libfuse", test))]
 mod fuse2_sys;
-#[cfg(feature = "libfuse3")]
+#[cfg(fuser_mount_impl = "libfuse3")]
 mod fuse3;
-#[cfg(feature = "libfuse3")]
+#[cfg(fuser_mount_impl = "libfuse3")]
 mod fuse3_sys;
 
-#[cfg(not(feature = "libfuse"))]
+#[cfg(fuser_mount_impl = "pure-rust")]
 mod fuse_pure;
 pub mod mount_options;
 
-#[cfg(any(feature = "libfuse", test))]
+#[cfg(any(test, feature = "libfuse"))]
 use fuse2_sys::fuse_args;
 #[cfg(any(test, not(feature = "libfuse")))]
 use std::fs::File;
-#[cfg(any(test, not(feature = "libfuse"), not(feature = "libfuse3")))]
+#[cfg(any(test, fuser_mount_impl = "pure-rust", fuser_mount_impl = "libfuse2"))]
 use std::io;
 
 #[cfg(any(feature = "libfuse", test))]
@@ -47,16 +47,16 @@ fn with_fuse_args<T, F: FnOnce(&fuse_args) -> T>(options: &[MountOption], f: F)
     })
 }
 
-#[cfg(feature = "libfuse2")]
+#[cfg(fuser_mount_impl = "libfuse2")]
 pub use fuse2::Mount;
-#[cfg(feature = "libfuse3")]
+#[cfg(fuser_mount_impl = "libfuse3")]
 pub use fuse3::Mount;
-#[cfg(not(feature = "libfuse"))]
+#[cfg(fuser_mount_impl = "pure-rust")]
 pub use fuse_pure::Mount;
-#[cfg(not(feature = "libfuse3"))]
+#[cfg(not(fuser_mount_impl = "libfuse3"))]
 use std::ffi::CStr;
 
-#[cfg(not(feature = "libfuse3"))]
+#[cfg(not(fuser_mount_impl = "libfuse3"))]
 #[inline]
 fn libc_umount(mnt: &CStr) -> io::Result<()> {
     #[cfg(any(
@@ -64,7 +64,6 @@ fn libc_umount(mnt: &CStr) -> io::Result<()> {
         target_os = "freebsd",
         target_os = "dragonfly",
         target_os = "openbsd",
-        target_os = "bitrig",
         target_os = "netbsd"
     ))]
     let r = unsafe { libc::unmount(mnt.as_ptr(), 0) };
@@ -74,7 +73,6 @@ fn libc_umount(mnt: &CStr) -> io::Result<()> {
         target_os = "freebsd",
         target_os = "dragonfly",
         target_os = "openbsd",
-        target_os = "bitrig",
         target_os = "netbsd"
     )))]
     let r = unsafe { libc::umount(mnt.as_ptr()) };
@@ -87,7 +85,7 @@ fn libc_umount(mnt: &CStr) -> io::Result<()> {
 
 /// Warning: This will return true if the filesystem has been detached (lazy unmounted), but not
 /// yet destroyed by the kernel.
-#[cfg(any(test, not(feature = "libfuse")))]
+#[cfg(any(test, fuser_mount_impl = "pure-rust"))]
 fn is_mounted(fuse_device: &File) -> bool {
     use libc::{poll, pollfd};
     use std::os::unix::prelude::AsRawFd;