diff --git a/jdk/src/share/sample/nio/file/Xdd.java b/jdk/src/share/sample/nio/file/Xdd.java
index b540b31fd1b..b5102976077 100644
--- a/jdk/src/share/sample/nio/file/Xdd.java
+++ b/jdk/src/share/sample/nio/file/Xdd.java
@@ -57,9 +57,9 @@ public class Xdd {
         Path file = (args.length == 1) ?
             Paths.get(args[0]) : Paths.get(args[2]);
 
-        // check that user defined attributes are supported by the file system
+        // check that user defined attributes are supported by the file store
         FileStore store = file.getFileStore();
-        if (!store.supportsFileAttributeView("user")) {
+        if (!store.supportsFileAttributeView(UserDefinedFileAttributeView.class)) {
             System.err.format("UserDefinedFileAttributeView not supported on %s\n", store);
             System.exit(-1);
 
diff --git a/jdk/src/solaris/classes/sun/nio/fs/LinuxFileStore.java b/jdk/src/solaris/classes/sun/nio/fs/LinuxFileStore.java
index 7eb45bde481..81132985b75 100644
--- a/jdk/src/solaris/classes/sun/nio/fs/LinuxFileStore.java
+++ b/jdk/src/solaris/classes/sun/nio/fs/LinuxFileStore.java
@@ -25,6 +25,7 @@
 
 package sun.nio.fs;
 
+import java.nio.file.attribute.*;
 import java.util.*;
 import java.io.IOException;
 
@@ -113,10 +114,12 @@ class LinuxFileStore
     }
 
     @Override
-    public boolean supportsFileAttributeView(String name) {
+    public boolean supportsFileAttributeView(Class<? extends FileAttributeView> type) {
         // support DosFileAttributeView and UserDefinedAttributeView if extended
         // attributes enabled
-        if (name.equals("dos") || name.equals("user")) {
+        if (type == DosFileAttributeView.class ||
+            type == UserDefinedFileAttributeView.class)
+        {
             // lookup fstypes.properties
             FeatureStatus status = checkIfFeaturePresent("user_xattr");
             if (status == FeatureStatus.PRESENT)
@@ -142,7 +145,15 @@ class LinuxFileStore
             }
             return xattrEnabled;
         }
+        return super.supportsFileAttributeView(type);
+    }
 
+    @Override
+    public boolean supportsFileAttributeView(String name) {
+        if (name.equals("dos"))
+            return supportsFileAttributeView(DosFileAttributeView.class);
+        if (name.equals("user"))
+            return supportsFileAttributeView(UserDefinedFileAttributeView.class);
         return super.supportsFileAttributeView(name);
     }
 
diff --git a/jdk/src/solaris/classes/sun/nio/fs/SolarisFileStore.java b/jdk/src/solaris/classes/sun/nio/fs/SolarisFileStore.java
index aaa737137d3..8cf2bbe0818 100644
--- a/jdk/src/solaris/classes/sun/nio/fs/SolarisFileStore.java
+++ b/jdk/src/solaris/classes/sun/nio/fs/SolarisFileStore.java
@@ -25,6 +25,7 @@
 
 package sun.nio.fs;
 
+import java.nio.file.attribute.*;
 import java.io.IOException;
 
 import static sun.nio.fs.UnixNativeDispatcher.*;
@@ -72,27 +73,39 @@ class SolarisFileStore
     }
 
     @Override
-    public boolean supportsFileAttributeView(String name) {
-        if (name.equals("acl")) {
+    public boolean supportsFileAttributeView(Class<? extends FileAttributeView> type) {
+        if (type == AclFileAttributeView.class) {
             // lookup fstypes.properties
             FeatureStatus status = checkIfFeaturePresent("nfsv4acl");
-            if (status == FeatureStatus.PRESENT)
-                return true;
-            if (status == FeatureStatus.NOT_PRESENT)
-                return false;
-            // AclFileAttributeView available on ZFS
-            return (type().equals("zfs"));
+            switch (status) {
+                case PRESENT     : return true;
+                case NOT_PRESENT : return false;
+                default :
+                    // AclFileAttributeView available on ZFS
+                    return (type().equals("zfs"));
+            }
         }
-        if (name.equals("user")) {
+        if (type == UserDefinedFileAttributeView.class) {
             // lookup fstypes.properties
             FeatureStatus status = checkIfFeaturePresent("xattr");
-            if (status == FeatureStatus.PRESENT)
-                return true;
-            if (status == FeatureStatus.NOT_PRESENT)
-                return false;
-            return xattrEnabled;
+            switch (status) {
+                case PRESENT     : return true;
+                case NOT_PRESENT : return false;
+                default :
+                    // UserDefinedFileAttributeView available if extended
+                    // attributes supported
+                    return xattrEnabled;
+            }
         }
+        return super.supportsFileAttributeView(type);
+    }
 
+    @Override
+    public boolean supportsFileAttributeView(String name) {
+        if (name.equals("acl"))
+            return supportsFileAttributeView(AclFileAttributeView.class);
+        if (name.equals("user"))
+            return supportsFileAttributeView(UserDefinedFileAttributeView.class);
         return super.supportsFileAttributeView(name);
     }
 
diff --git a/jdk/src/solaris/classes/sun/nio/fs/UnixFileStore.java b/jdk/src/solaris/classes/sun/nio/fs/UnixFileStore.java
index 02397648eae..f19b2f90fe8 100644
--- a/jdk/src/solaris/classes/sun/nio/fs/UnixFileStore.java
+++ b/jdk/src/solaris/classes/sun/nio/fs/UnixFileStore.java
@@ -145,9 +145,8 @@ abstract class UnixFileStore
         {
             // lookup fstypes.properties
             FeatureStatus status = checkIfFeaturePresent("posix");
-            if (status == FeatureStatus.NOT_PRESENT)
-                return false;
-            return true;
+            // assume supported if UNKNOWN
+            return (status != FeatureStatus.NOT_PRESENT);
         }
         return false;
     }
diff --git a/jdk/src/windows/classes/sun/nio/fs/WindowsFileStore.java b/jdk/src/windows/classes/sun/nio/fs/WindowsFileStore.java
index a906b54e0de..5af14f1673f 100644
--- a/jdk/src/windows/classes/sun/nio/fs/WindowsFileStore.java
+++ b/jdk/src/windows/classes/sun/nio/fs/WindowsFileStore.java
@@ -153,7 +153,7 @@ class WindowsFileStore
     public boolean supportsFileAttributeView(Class<? extends FileAttributeView> type) {
         if (type == null)
             throw new NullPointerException();
-        if (type == BasicFileAttributeView.class)
+        if (type == BasicFileAttributeView.class || type == DosFileAttributeView.class)
             return true;
         if (type == AclFileAttributeView.class || type == FileOwnerAttributeView.class)
             return ((volInfo.flags() & FILE_PERSISTENT_ACLS) != 0);
diff --git a/jdk/test/java/nio/file/FileStore/Basic.java b/jdk/test/java/nio/file/FileStore/Basic.java
index 604795db435..85e6b992a57 100644
--- a/jdk/test/java/nio/file/FileStore/Basic.java
+++ b/jdk/test/java/nio/file/FileStore/Basic.java
@@ -22,7 +22,7 @@
  */
 
 /* @test
- * @bug 4313887
+ * @bug 4313887 6873621
  * @summary Unit test for java.nio.file.FileStore
  * @library ..
  */
@@ -67,6 +67,15 @@ public class Basic {
          * Test: File and FileStore attributes
          */
         assertTrue(store1.supportsFileAttributeView("basic"));
+        assertTrue(store1.supportsFileAttributeView(BasicFileAttributeView.class));
+        assertTrue(store1.supportsFileAttributeView("posix") ==
+            store1.supportsFileAttributeView(PosixFileAttributeView.class));
+        assertTrue(store1.supportsFileAttributeView("dos") ==
+            store1.supportsFileAttributeView(DosFileAttributeView.class));
+        assertTrue(store1.supportsFileAttributeView("acl") ==
+            store1.supportsFileAttributeView(AclFileAttributeView.class));
+        assertTrue(store1.supportsFileAttributeView("user") ==
+            store1.supportsFileAttributeView(UserDefinedFileAttributeView.class));
 
         /**
          * Test: Enumerate all FileStores