8260966: (fs) Consolidate Linux and macOS implementations of UserDefi…

…nedFileAttributeView

8260691: (fs) LinuxNativeDispatcher should link to xattr functions

Reviewed-by: alanb

src/java.base/linux/classes/sun/nio/fs/LinuxFileStore.java

@@ -105,27 +105,6 @@ UnixMountEntry findMountEntry() throws IOException {
         throw new IOException("Mount point not found");
     }
 
-    // returns true if extended attributes enabled on file system where given
-    // file resides, returns false if disabled or unable to determine.
-    private boolean isExtendedAttributesEnabled(UnixPath path) {
-        int fd = -1;
-        try {
-            fd = path.openForAttributeAccess(false);
-
-            // fgetxattr returns size if called with size==0
-            byte[] name = Util.toBytes("user.java");
-            LinuxNativeDispatcher.fgetxattr(fd, name, 0L, 0);
-            return true;
-        } catch (UnixException e) {
-            // attribute does not exist
-            if (e.errno() == UnixConstants.ENODATA)
-                return true;
-        } finally {
-            UnixNativeDispatcher.close(fd);
-        }
-        return false;
-    }
-
     // get kernel version as a three element array {major, minor, micro}
     private static int[] getKernelVersion() {
         Pattern pattern = Pattern.compile("\\D+");

src/java.base/linux/classes/sun/nio/fs/LinuxFileSystem.java

@@ -69,7 +69,7 @@ public Set<String> supportedFileAttributeViews() {
 
     @Override
     void copyNonPosixAttributes(int ofd, int nfd) {
-        LinuxUserDefinedFileAttributeView.copyExtendedAttributes(ofd, nfd);
+        UnixUserDefinedFileAttributeView.copyExtendedAttributes(ofd, nfd);
     }
 
     /**

src/java.base/linux/classes/sun/nio/fs/LinuxNativeDispatcher.java

@@ -69,61 +69,6 @@ static native int getmntent0(long fp, UnixMountEntry entry, long buffer, int buf
      */
     static native void endmntent(long stream) throws UnixException;
 
-    /**
-     * ssize_t fgetxattr(int filedes, const char *name, void *value, size_t size);
-     */
-    static int fgetxattr(int filedes, byte[] name, long valueAddress,
-                         int valueLen) throws UnixException
-    {
-        NativeBuffer buffer = NativeBuffers.asNativeBuffer(name);
-        try {
-            return fgetxattr0(filedes, buffer.address(), valueAddress, valueLen);
-        } finally {
-            buffer.release();
-        }
-    }
-
-    private static native int fgetxattr0(int filedes, long nameAddress,
-        long valueAddress, int valueLen) throws UnixException;
-
-    /**
-     *  fsetxattr(int filedes, const char *name, const void *value, size_t size, int flags);
-     */
-    static void fsetxattr(int filedes, byte[] name, long valueAddress,
-        int valueLen) throws UnixException
-    {
-        NativeBuffer buffer = NativeBuffers.asNativeBuffer(name);
-        try {
-            fsetxattr0(filedes, buffer.address(), valueAddress, valueLen);
-        } finally {
-            buffer.release();
-        }
-    }
-
-    private static native void fsetxattr0(int filedes, long nameAddress,
-        long valueAddress, int valueLen) throws UnixException;
-
-    /**
-     * fremovexattr(int filedes, const char *name);
-     */
-    static void fremovexattr(int filedes, byte[] name) throws UnixException {
-        NativeBuffer buffer = NativeBuffers.asNativeBuffer(name);
-        try {
-            fremovexattr0(filedes, buffer.address());
-        } finally {
-            buffer.release();
-        }
-    }
-
-    private static native void fremovexattr0(int filedes, long nameAddress)
-        throws UnixException;
-
-    /**
-     * size_t flistxattr(int filedes, const char *list, size_t size)
-     */
-    static native int flistxattr(int filedes, long listAddress, int size)
-        throws UnixException;
-
     // initialize
     private static native void init();