diff --git a/src/dawn_native/Buffer.cpp b/src/dawn_native/Buffer.cpp
index 5f814be..1db64a7 100644
--- a/src/dawn_native/Buffer.cpp
+++ b/src/dawn_native/Buffer.cpp
@@ -54,7 +54,7 @@
             }
 
           private:
-            bool IsMapWritable() const override {
+            bool IsMappableAtCreation() const override {
                 UNREACHABLE();
                 return false;
             }
@@ -173,7 +173,7 @@
         }
 
         // Mappable buffers don't use a staging buffer and are just as if mapped through MapAsync.
-        if (IsMapWritable()) {
+        if (IsMappableAtCreation()) {
             DAWN_TRY(MapAtCreationImpl());
             return {};
         }
@@ -348,7 +348,7 @@
             if (mStagingBuffer != nullptr) {
                 mStagingBuffer.reset();
             } else if (mSize != 0) {
-                ASSERT(IsMapWritable());
+                ASSERT(IsMappableAtCreation());
                 Unmap();
             }
         }
@@ -399,7 +399,7 @@
             if (mStagingBuffer != nullptr) {
                 GetDevice()->ConsumedError(CopyFromStagingBuffer());
             } else if (mSize != 0) {
-                ASSERT(IsMapWritable());
+                ASSERT(IsMappableAtCreation());
                 UnmapImpl();
             }
         }
diff --git a/src/dawn_native/Buffer.h b/src/dawn_native/Buffer.h
index f4a5377..457e415 100644
--- a/src/dawn_native/Buffer.h
+++ b/src/dawn_native/Buffer.h
@@ -83,7 +83,7 @@
         virtual void DestroyImpl() = 0;
         virtual void* GetMappedPointerImpl() = 0;
 
-        virtual bool IsMapWritable() const = 0;
+        virtual bool IsMappableAtCreation() const = 0;
         MaybeError CopyFromStagingBuffer();
         void* GetMappedRangeInternal(bool writable);
         void CallMapReadCallback(uint32_t serial,
diff --git a/src/dawn_native/d3d12/BufferD3D12.cpp b/src/dawn_native/d3d12/BufferD3D12.cpp
index 808b134..c38545b 100644
--- a/src/dawn_native/d3d12/BufferD3D12.cpp
+++ b/src/dawn_native/d3d12/BufferD3D12.cpp
@@ -243,7 +243,7 @@
         return mResourceAllocation.GetGPUPointer();
     }
 
-    bool Buffer::IsMapWritable() const {
+    bool Buffer::IsMappableAtCreation() const {
         // TODO(enga): Handle CPU-visible memory on UMA
         return (GetUsage() & (wgpu::BufferUsage::MapRead | wgpu::BufferUsage::MapWrite)) != 0;
     }
diff --git a/src/dawn_native/d3d12/BufferD3D12.h b/src/dawn_native/d3d12/BufferD3D12.h
index bb25558..33804d7 100644
--- a/src/dawn_native/d3d12/BufferD3D12.h
+++ b/src/dawn_native/d3d12/BufferD3D12.h
@@ -57,7 +57,7 @@
         void UnmapImpl() override;
         void DestroyImpl() override;
 
-        bool IsMapWritable() const override;
+        bool IsMappableAtCreation() const override;
         virtual MaybeError MapAtCreationImpl() override;
         void* GetMappedPointerImpl() override;
         MaybeError MapInternal(bool isWrite, const char* contextInfo);
diff --git a/src/dawn_native/metal/BufferMTL.h b/src/dawn_native/metal/BufferMTL.h
index 38c403c..f26c7e0 100644
--- a/src/dawn_native/metal/BufferMTL.h
+++ b/src/dawn_native/metal/BufferMTL.h
@@ -47,7 +47,7 @@
         void DestroyImpl() override;
         void* GetMappedPointerImpl() override;
 
-        bool IsMapWritable() const override;
+        bool IsMappableAtCreation() const override;
         MaybeError MapAtCreationImpl() override;
 
         void InitializeToZero(CommandRecordingContext* commandContext);
diff --git a/src/dawn_native/metal/BufferMTL.mm b/src/dawn_native/metal/BufferMTL.mm
index 5b10a8d..d231e86 100644
--- a/src/dawn_native/metal/BufferMTL.mm
+++ b/src/dawn_native/metal/BufferMTL.mm
@@ -104,7 +104,7 @@
         return mMtlBuffer;
     }
 
-    bool Buffer::IsMapWritable() const {
+    bool Buffer::IsMappableAtCreation() const {
         // TODO(enga): Handle CPU-visible memory on UMA
         return (GetUsage() & (wgpu::BufferUsage::MapRead | wgpu::BufferUsage::MapWrite)) != 0;
     }
diff --git a/src/dawn_native/null/DeviceNull.cpp b/src/dawn_native/null/DeviceNull.cpp
index 71085cd..ab430c3 100644
--- a/src/dawn_native/null/DeviceNull.cpp
+++ b/src/dawn_native/null/DeviceNull.cpp
@@ -280,7 +280,7 @@
         ToBackend(GetDevice())->DecrementMemoryUsage(GetSize());
     }
 
-    bool Buffer::IsMapWritable() const {
+    bool Buffer::IsMappableAtCreation() const {
         // Only return true for mappable buffers so we can test cases that need / don't need a
         // staging buffer.
         return (GetUsage() & (wgpu::BufferUsage::MapRead | wgpu::BufferUsage::MapWrite)) != 0;
diff --git a/src/dawn_native/null/DeviceNull.h b/src/dawn_native/null/DeviceNull.h
index 1c98664..94d3826 100644
--- a/src/dawn_native/null/DeviceNull.h
+++ b/src/dawn_native/null/DeviceNull.h
@@ -204,7 +204,7 @@
         void UnmapImpl() override;
         void DestroyImpl() override;
 
-        bool IsMapWritable() const override;
+        bool IsMappableAtCreation() const override;
         MaybeError MapAtCreationImpl() override;
         void* GetMappedPointerImpl() override;
 
diff --git a/src/dawn_native/opengl/BufferGL.cpp b/src/dawn_native/opengl/BufferGL.cpp
index c0bd7f3..e7398d6 100644
--- a/src/dawn_native/opengl/BufferGL.cpp
+++ b/src/dawn_native/opengl/BufferGL.cpp
@@ -92,7 +92,7 @@
         SetIsDataInitialized();
     }
 
-    bool Buffer::IsMapWritable() const {
+    bool Buffer::IsMappableAtCreation() const {
         // TODO(enga): All buffers in GL can be mapped. Investigate if mapping them will cause the
         // driver to migrate it to shared memory.
         return true;
diff --git a/src/dawn_native/opengl/BufferGL.h b/src/dawn_native/opengl/BufferGL.h
index 9bc870e..8dbe764 100644
--- a/src/dawn_native/opengl/BufferGL.h
+++ b/src/dawn_native/opengl/BufferGL.h
@@ -40,7 +40,7 @@
         void UnmapImpl() override;
         void DestroyImpl() override;
 
-        bool IsMapWritable() const override;
+        bool IsMappableAtCreation() const override;
         MaybeError MapAtCreationImpl() override;
         void* GetMappedPointerImpl() override;
         uint64_t GetAppliedSize() const;
diff --git a/src/dawn_native/vulkan/BufferVk.cpp b/src/dawn_native/vulkan/BufferVk.cpp
index 4175324..a3dcf2e 100644
--- a/src/dawn_native/vulkan/BufferVk.cpp
+++ b/src/dawn_native/vulkan/BufferVk.cpp
@@ -234,7 +234,7 @@
         mLastUsage = usage;
     }
 
-    bool Buffer::IsMapWritable() const {
+    bool Buffer::IsMappableAtCreation() const {
         // TODO(enga): Handle CPU-visible memory on UMA
         return mMemoryAllocation.GetMappedPointer() != nullptr;
     }
diff --git a/src/dawn_native/vulkan/BufferVk.h b/src/dawn_native/vulkan/BufferVk.h
index 14be757..d0d3ea2 100644
--- a/src/dawn_native/vulkan/BufferVk.h
+++ b/src/dawn_native/vulkan/BufferVk.h
@@ -61,7 +61,7 @@
         void UnmapImpl() override;
         void DestroyImpl() override;
 
-        bool IsMapWritable() const override;
+        bool IsMappableAtCreation() const override;
         MaybeError MapAtCreationImpl() override;
         void* GetMappedPointerImpl() override;