8353053: (fs) Add support for UserDefinedFileAttributeView on AIX

Backport-of: 1161b566ca06786996cf47a4475bcdabaa24cde8

Author: Varada M

src/java.base/aix/classes/sun/nio/fs/AixFileStore.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2008, 2025, Oracle and/or its affiliates. All rights reserved.
  * Copyright (c) 2013 SAP SE. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
@@ -88,18 +88,32 @@ UnixMountEntry findMountEntry() throws IOException {
         throw new IOException("Mount point not found");
     }
 
-    @Override
-    protected boolean isExtendedAttributesEnabled(UnixPath path) {
-        return false;
-    }
-
     @Override
     public boolean supportsFileAttributeView(Class<? extends FileAttributeView> type) {
+        // support UserDefinedAttributeView if extended attributes enabled
+        if (type == UserDefinedFileAttributeView.class) {
+            // lookup fstypes.properties
+            FeatureStatus status = checkIfFeaturePresent("user_xattr");
+            if (status == FeatureStatus.PRESENT)
+                return true;
+            if (status == FeatureStatus.NOT_PRESENT)
+                return false;
+
+            // typical AIX file system types that support xattr (JFS2 with EA enabled)
+            String fstype = entry().fstype();
+            if ("jfs2".equals(fstype)) {
+                UnixPath dir = new UnixPath(file().getFileSystem(), entry().dir());
+                return isExtendedAttributesEnabled(dir);
+            }
+        }
         return super.supportsFileAttributeView(type);
     }
 
     @Override
     public boolean supportsFileAttributeView(String name) {
+        if (name.equals("user"))
+            return supportsFileAttributeView(UserDefinedFileAttributeView.class);
         return super.supportsFileAttributeView(name);
     }
+
 }

src/java.base/aix/classes/sun/nio/fs/AixFileSystem.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2008, 2025, Oracle and/or its affiliates. All rights reserved.
  * Copyright (c) 2013 SAP SE. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
@@ -56,6 +56,7 @@ private static class SupportedFileFileAttributeViewsHolder {
         private static Set<String> supportedFileAttributeViews() {
             Set<String> result = new HashSet<String>();
             result.addAll(UnixFileSystem.standardFileAttributeViews());
+            result.add("user");
             return Collections.unmodifiableSet(result);
         }
     }

src/java.base/aix/classes/sun/nio/fs/AixFileSystemProvider.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008, 2013, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2008, 2025, Oracle and/or its affiliates. All rights reserved.
  * Copyright (c) 2013 SAP SE. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
@@ -26,6 +26,8 @@
 
 package sun.nio.fs;
 
+import java.nio.file.*;
+import java.nio.file.attribute.*;
 import java.io.IOException;
 
 /**
@@ -49,4 +51,29 @@ AixFileSystem newFileSystem(String dir) {
     AixFileStore getFileStore(UnixPath path) throws IOException {
         return new AixFileStore(path);
     }
+
+    @Override
+    @SuppressWarnings("unchecked")
+    public <V extends FileAttributeView> V getFileAttributeView(Path obj,
+                                                                Class<V> type,
+                                                                LinkOption... options)
+    {
+        if (type == UserDefinedFileAttributeView.class) {
+            return (V) new AixUserDefinedFileAttributeView(UnixPath.toUnixPath(obj),
+                    Util.followLinks(options));
+        }
+        return super.getFileAttributeView(obj, type, options);
+    }
+
+    @Override
+    public DynamicFileAttributeView getFileAttributeView(Path obj,
+                                                         String name,
+                                                         LinkOption... options)
+    {
+        if (name.equals("user")) {
+            return new AixUserDefinedFileAttributeView(UnixPath.toUnixPath(obj),
+                    Util.followLinks(options));
+        }
+        return super.getFileAttributeView(obj, name, options);
+    }
 }

src/java.base/aix/classes/sun/nio/fs/AixUserDefinedFileAttributeView.java

@@ -0,0 +1,41 @@
+/*
+ * Copyright (c) 2025, 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
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package sun.nio.fs;
+
+class AixUserDefinedFileAttributeView
+    extends UnixUserDefinedFileAttributeView
+{
+
+    AixUserDefinedFileAttributeView(UnixPath file, boolean followLinks) {
+        super(file, followLinks);
+    }
+
+    @Override
+    protected int maxNameLength() {
+        return 255;
+    }
+
+}

src/java.base/unix/classes/sun/nio/fs/UnixConstants.java.template

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008, 2024, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2008, 2025, 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
@@ -124,6 +124,8 @@ class UnixConstants {
 // fgetxattr error codes for absent attributes depend on the OS:
 #ifdef _ALLBSD_SOURCE
     static final int PREFIX_XATTR_NOT_FOUND = ENOATTR;
+#elif defined(_AIX)
+    static final int PREFIX_XATTR_NOT_FOUND = ENOATTR;
 #elif defined(__linux__)
     static final int PREFIX_XATTR_NOT_FOUND = ENODATA;
 #else

src/java.base/unix/native/libnio/fs/UnixNativeDispatcher.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008, 2024, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2008, 2025, 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
@@ -46,6 +46,10 @@
 #include <sys/xattr.h>
 #endif
 
+#if defined(_AIX)
+#include <sys/ea.h>
+#endif
+
 /* For POSIX-compliant getpwuid_r */
 #include <pwd.h>
 #include <grp.h>
@@ -387,7 +391,7 @@ Java_sun_nio_fs_UnixNativeDispatcher_init(JNIEnv* env, jclass this)
 
     /* supports extended attributes */
 
-#if defined(_SYS_XATTR_H) || defined(_SYS_XATTR_H_)
+#if defined(_SYS_XATTR_H) || defined(_SYS_XATTR_H_) || defined(_AIX)
     capabilities |= sun_nio_fs_UnixNativeDispatcher_SUPPORTS_XATTR;
 #endif
 
@@ -1381,6 +1385,8 @@ Java_sun_nio_fs_UnixNativeDispatcher_fgetxattr0(JNIEnv* env, jclass clazz,
     res = fgetxattr(fd, name, value, valueLen);
 #elif defined(_ALLBSD_SOURCE)
     res = fgetxattr(fd, name, value, valueLen, 0, 0);
+#elif defined(_AIX)
+    res = fgetea(fd, name, value, valueLen);
 #else
     throwUnixException(env, ENOTSUP);
 #endif
@@ -1402,6 +1408,8 @@ Java_sun_nio_fs_UnixNativeDispatcher_fsetxattr0(JNIEnv* env, jclass clazz,
     res = fsetxattr(fd, name, value, valueLen, 0);
 #elif defined(_ALLBSD_SOURCE)
     res = fsetxattr(fd, name, value, valueLen, 0, 0);
+#elif defined(_AIX)
+    res = fsetea(fd, name, value, valueLen, 0);
 #else
     throwUnixException(env, ENOTSUP);
 #endif
@@ -1421,6 +1429,8 @@ Java_sun_nio_fs_UnixNativeDispatcher_fremovexattr0(JNIEnv* env, jclass clazz,
     res = fremovexattr(fd, name);
 #elif defined(_ALLBSD_SOURCE)
     res = fremovexattr(fd, name, 0);
+#elif defined(_AIX)
+    res = fremoveea(fd, name);
 #else
     throwUnixException(env, ENOTSUP);
 #endif
@@ -1440,6 +1450,8 @@ Java_sun_nio_fs_UnixNativeDispatcher_flistxattr(JNIEnv* env, jclass clazz,
     res = flistxattr(fd, list, (size_t)size);
 #elif defined(_ALLBSD_SOURCE)
     res = flistxattr(fd, list, (size_t)size, 0);
+#elif defined(_AIX)
+    res = flistea(fd, list, (size_t)size);
 #else
     throwUnixException(env, ENOTSUP);
 #endif