diff --git a/model/Disk.cpp b/model/Disk.cpp
index 1568ba4..b66c336 100644
--- a/model/Disk.cpp
+++ b/model/Disk.cpp
@@ -153,7 +153,7 @@
     return nullptr;
 }
 
-void Disk::listVolumes(VolumeBase::Type type, std::list<std::string>& list) {
+void Disk::listVolumes(VolumeBase::Type type, std::list<std::string>& list) const {
     for (const auto& vol : mVolumes) {
         if (vol->getType() == type) {
             list.push_back(vol->getId());
diff --git a/model/Disk.h b/model/Disk.h
index 3140144..889e906 100644
--- a/model/Disk.h
+++ b/model/Disk.h
@@ -54,18 +54,18 @@
         kEmmc = 1 << 4,
     };
 
-    const std::string& getId() { return mId; }
-    const std::string& getEventPath() { return mEventPath; }
-    const std::string& getSysPath() { return mSysPath; }
-    const std::string& getDevPath() { return mDevPath; }
-    dev_t getDevice() { return mDevice; }
-    uint64_t getSize() { return mSize; }
-    const std::string& getLabel() { return mLabel; }
-    int getFlags() { return mFlags; }
+    const std::string& getId() const { return mId; }
+    const std::string& getEventPath() const { return mEventPath; }
+    const std::string& getSysPath() const { return mSysPath; }
+    const std::string& getDevPath() const { return mDevPath; }
+    dev_t getDevice() const { return mDevice; }
+    uint64_t getSize() const { return mSize; }
+    const std::string& getLabel() const { return mLabel; }
+    int getFlags() const { return mFlags; }
 
     std::shared_ptr<VolumeBase> findVolume(const std::string& id);
 
-    void listVolumes(VolumeBase::Type type, std::list<std::string>& list);
+    void listVolumes(VolumeBase::Type type, std::list<std::string>& list) const;
 
     status_t create();
     status_t destroy();
diff --git a/model/PrivateVolume.h b/model/PrivateVolume.h
index 85aa4dc..cb8e75d 100644
--- a/model/PrivateVolume.h
+++ b/model/PrivateVolume.h
@@ -39,9 +39,9 @@
   public:
     PrivateVolume(dev_t device, const std::string& keyRaw);
     virtual ~PrivateVolume();
-    const std::string& getFsType() { return mFsType; };
-    const std::string& getRawDevPath() { return mRawDevPath; };
-    const std::string& getRawDmDevPath() { return mDmDevPath; };
+    const std::string& getFsType() const { return mFsType; };
+    const std::string& getRawDevPath() const { return mRawDevPath; };
+    const std::string& getRawDmDevPath() const { return mDmDevPath; };
 
   protected:
     status_t doCreate() override;
diff --git a/model/VolumeBase.cpp b/model/VolumeBase.cpp
index 300add1..b04dd70 100644
--- a/model/VolumeBase.cpp
+++ b/model/VolumeBase.cpp
@@ -143,7 +143,7 @@
     return OK;
 }
 
-android::sp<android::os::IVoldListener> VolumeBase::getListener() {
+android::sp<android::os::IVoldListener> VolumeBase::getListener() const {
     if (mSilent) {
         return nullptr;
     } else {
diff --git a/model/VolumeBase.h b/model/VolumeBase.h
index 92a83f0..28802d4 100644
--- a/model/VolumeBase.h
+++ b/model/VolumeBase.h
@@ -76,15 +76,15 @@
         kBadRemoval,
     };
 
-    const std::string& getId() { return mId; }
-    const std::string& getDiskId() { return mDiskId; }
-    const std::string& getPartGuid() { return mPartGuid; }
-    Type getType() { return mType; }
-    int getMountFlags() { return mMountFlags; }
-    userid_t getMountUserId() { return mMountUserId; }
-    State getState() { return mState; }
-    const std::string& getPath() { return mPath; }
-    const std::string& getInternalPath() { return mInternalPath; }
+    const std::string& getId() const { return mId; }
+    const std::string& getDiskId() const { return mDiskId; }
+    const std::string& getPartGuid() const { return mPartGuid; }
+    Type getType() const { return mType; }
+    int getMountFlags() const { return mMountFlags; }
+    userid_t getMountUserId() const { return mMountUserId; }
+    State getState() const { return mState; }
+    const std::string& getPath() const { return mPath; }
+    const std::string& getInternalPath() const { return mInternalPath; }
 
     status_t setDiskId(const std::string& diskId);
     status_t setPartGuid(const std::string& partGuid);
@@ -116,7 +116,7 @@
     status_t setPath(const std::string& path);
     status_t setInternalPath(const std::string& internalPath);
 
-    android::sp<android::os::IVoldListener> getListener();
+    android::sp<android::os::IVoldListener> getListener() const;
 
   private:
     /* ID that uniquely references volume while alive */