diff --git a/src/backups.rs b/src/backups.rs
index a660110..68f37ea 100644
--- a/src/backups.rs
+++ b/src/backups.rs
@@ -43,7 +43,7 @@ impl BackupTarget {
 
     pub fn path(&self, storages: &Storages, device: &Device) -> Result<PathBuf> {
         let parent = storages.get(&self.storage).unwrap();
-        let parent_path = parent.mount_path(device, storages)?;
+        let parent_path = parent.mount_path(device)?;
         Ok(parent_path.join(self.path.clone()))
     }
 }
diff --git a/src/cmd_storage.rs b/src/cmd_storage.rs
index 8380d91..e8c4fa4 100644
--- a/src/cmd_storage.rs
+++ b/src/cmd_storage.rs
@@ -213,7 +213,7 @@ fn write_storages_list(
         } else {
             " "
         };
-        let path = storage.mount_path(&device, &storages).map_or_else(
+        let path = storage.mount_path(&device).map_or_else(
             |e| {
                 info!("Not found: {}", e);
                 "".to_string()
diff --git a/src/storages.rs b/src/storages.rs
index 4371a23..d4a0793 100644
--- a/src/storages.rs
+++ b/src/storages.rs
@@ -68,11 +68,11 @@ impl StorageExt for Storage {
         }
     }
 
-    fn mount_path(&self, device: &devices::Device, storages: &Storages) -> Result<path::PathBuf> {
+    fn mount_path(&self, device: &devices::Device) -> Result<path::PathBuf> {
         match self {
-            Self::PhysicalStorage(s) => s.mount_path(&device, &storages),
-            Self::SubDirectory(s) => s.mount_path(&device, &storages),
-            Self::Online(s) => s.mount_path(&device, &storages),
+            Self::PhysicalStorage(s) => s.mount_path(&device),
+            Self::SubDirectory(s) => s.mount_path(&device),
+            Self::Online(s) => s.mount_path(&device),
         }
     }
 
@@ -135,7 +135,7 @@ pub trait StorageExt {
 
     /// Get mount path of `self` on `device`.
     /// `storages` is a `HashMap` with key of storage name and value of the storage.
-    fn mount_path(&self, device: &devices::Device, storages: &Storages) -> Result<path::PathBuf>;
+    fn mount_path(&self, device: &devices::Device) -> Result<path::PathBuf>;
 
     /// Add local info of `device` to `self`.
     fn bound_on_device(
diff --git a/src/storages/directory.rs b/src/storages/directory.rs
index ebeaeee..5178c14 100644
--- a/src/storages/directory.rs
+++ b/src/storages/directory.rs
@@ -1,12 +1,8 @@
 //! Manipulate subdirectories of other storages, including directories.
 
-use anyhow::{anyhow, Context, Result};
+use anyhow::{Context, Result};
 use serde::{Deserialize, Serialize};
-use std::{
-    collections::HashMap,
-    fmt::{self, format},
-    path,
-};
+use std::{collections::HashMap, fmt, path};
 
 use crate::devices;
 use crate::util;
@@ -84,7 +80,7 @@ impl Directory {
         let parent_mount_path = self
             .parent(&storages)
             .context("Can't find parent storage")?
-            .mount_path(&device, &storages)?;
+            .mount_path(&device)?;
         Ok(parent_mount_path.join(self.relative_path.clone()))
     }
 }
@@ -102,7 +98,7 @@ impl StorageExt for Directory {
         self.local_infos.get(&device.name())
     }
 
-    fn mount_path(&self, device: &devices::Device, storages: &Storages) -> Result<path::PathBuf> {
+    fn mount_path(&self, device: &devices::Device) -> Result<path::PathBuf> {
         Ok(self
             .local_infos
             .get(&device.name())
@@ -197,7 +193,7 @@ mod test {
             storages
                 .get(&"test_name".to_string())
                 .unwrap()
-                .mount_path(&device, &storages)
+                .mount_path(&device)
                 .unwrap(),
             PathBuf::from("/mnt/sample/subdir")
         );
diff --git a/src/storages/online_storage.rs b/src/storages/online_storage.rs
index 392252b..746e669 100644
--- a/src/storages/online_storage.rs
+++ b/src/storages/online_storage.rs
@@ -63,7 +63,6 @@ impl StorageExt for OnlineStorage {
     fn mount_path(
         &self,
         device: &devices::Device,
-        _storages: &Storages,
     ) -> Result<std::path::PathBuf> {
         Ok(self
             .local_infos
diff --git a/src/storages/physical_drive_partition.rs b/src/storages/physical_drive_partition.rs
index d8b9846..e410d3f 100644
--- a/src/storages/physical_drive_partition.rs
+++ b/src/storages/physical_drive_partition.rs
@@ -141,7 +141,7 @@ impl StorageExt for PhysicalDrivePartition {
         self.local_infos.get(&device.name())
     }
 
-    fn mount_path(&self, device: &devices::Device, _: &Storages) -> Result<path::PathBuf> {
+    fn mount_path(&self, device: &devices::Device) -> Result<path::PathBuf> {
         Ok(self
             .local_infos
             .get(&device.name())
diff --git a/src/util.rs b/src/util.rs
index 3a40f8d..90ead30 100644
--- a/src/util.rs
+++ b/src/util.rs
@@ -17,7 +17,7 @@ pub fn min_parent_storage<'a>(
         .list
         .iter()
         .filter_map(|(k, storage)| {
-            let storage_path = match storage.mount_path(device, storages) {
+            let storage_path = match storage.mount_path(device) {
                 Ok(path) => path,
                 Err(_) => return None,
             };