8264400: (fs) WindowsFileStore equality depends on how the FileStore …

…was constructed

Reviewed-by: alanb

src/java.base/windows/classes/sun/nio/fs/WindowsFileStore.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008, 2019, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2008, 2021, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -25,9 +25,17 @@
 
 package sun.nio.fs;
 
-import java.nio.file.*;
-import java.nio.file.attribute.*;
+import java.nio.file.FileStore;
+import java.nio.file.FileSystemException;
+import java.nio.file.attribute.AclFileAttributeView;
+import java.nio.file.attribute.BasicFileAttributeView;
+import java.nio.file.attribute.DosFileAttributeView;
+import java.nio.file.attribute.FileAttributeView;
+import java.nio.file.attribute.FileOwnerAttributeView;
+import java.nio.file.attribute.FileStoreAttributeView;
+import java.nio.file.attribute.UserDefinedFileAttributeView;
 import java.io.IOException;
+import java.util.Locale;
 
 import static sun.nio.fs.WindowsConstants.*;
 import static sun.nio.fs.WindowsNativeDispatcher.*;
@@ -44,6 +52,8 @@ class WindowsFileStore
     private final int volType;
     private final String displayName;   // returned by toString
 
+    private int hashCode;
+
     private WindowsFileStore(String root) throws WindowsException {
         assert root.charAt(root.length()-1) == '\\';
         this.root = root;
@@ -229,15 +239,22 @@ public boolean supportsFileAttributeView(String name) {
     public boolean equals(Object ob) {
         if (ob == this)
             return true;
-        if (!(ob instanceof WindowsFileStore))
-            return false;
-        WindowsFileStore other = (WindowsFileStore)ob;
-        return root.equals(other.root);
+        if (ob instanceof WindowsFileStore other) {
+            if (root.equals(other.root))
+                return true;
+            if (volType == DRIVE_FIXED && other.volumeType() == DRIVE_FIXED)
+                return root.equalsIgnoreCase(other.root);
+        }
+        return false;
     }
 
     @Override
     public int hashCode() {
-        return root.hashCode();
+        if (hashCode == 0) { // Don't care about race
+            hashCode = (volType == DRIVE_FIXED) ?
+                root.toLowerCase(Locale.ROOT).hashCode() : root.hashCode();
+        }
+        return hashCode;
     }
 
     @Override
@@ -251,4 +268,4 @@ public String toString() {
         sb.append(")");
         return sb.toString();
     }
- }
+}

test/jdk/java/nio/file/FileStore/Basic.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008, 2020, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2008, 2021, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -22,7 +22,7 @@
  */
 
 /* @test
- * @bug 4313887 6873621 6979526 7006126 7020517
+ * @bug 4313887 6873621 6979526 7006126 7020517 8264400
  * @summary Unit test for java.nio.file.FileStore
  * @key intermittent
  * @library .. /test/lib
@@ -36,9 +36,9 @@
 import java.io.File;
 import java.io.IOException;
 
+import jdk.test.lib.Platform;
 import jdk.test.lib.util.FileUtils;
 
-
 public class Basic {
 
     static final long G = 1024L * 1024L * 1024L;
@@ -80,6 +80,15 @@ static void doTests(Path dir) throws IOException {
         assertTrue(store2.equals(store1));
         assertTrue(store1.hashCode() == store2.hashCode());
 
+        if (Platform.isWindows()) {
+            /**
+             * Test: FileStore.equals() should not be case sensitive
+             */
+            FileStore upper = Files.getFileStore(Path.of("C:\\"));
+            FileStore lower = Files.getFileStore(Path.of("c:\\"));
+            assertTrue(lower.equals(upper));
+        }
+
         /**
          * Test: File and FileStore attributes
          */