8187443: Forest Consolidation: Move files to unified layout

Reviewed-by: darcy, ihse

src/java.base/unix/classes/sun/nio/fs/DefaultFileTypeDetector.java

@@ -0,0 +1,39 @@
+/*
+ * Copyright (c) 2008, 2012, 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;
+
+import java.nio.file.FileSystems;
+import java.nio.file.spi.FileTypeDetector;
+import java.nio.file.spi.FileSystemProvider;
+
+public class DefaultFileTypeDetector {
+    private DefaultFileTypeDetector() { }
+
+    public static FileTypeDetector create() {
+        FileSystemProvider provider = FileSystems.getDefault().provider();
+        return ((UnixFileSystemProvider)provider).getFileTypeDetector();
+    }
+}

src/java.base/unix/classes/sun/nio/fs/MimeTypesFileTypeDetector.java

@@ -0,0 +1,196 @@
+/*
+ * Copyright (c) 2015, 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;
+
+import java.io.IOException;
+import java.nio.charset.Charset;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.security.AccessController;
+import java.security.PrivilegedAction;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+/**
+ * File type detector that uses a file extension to look up its MIME type
+ * based on a mime.types file.
+ */
+
+class MimeTypesFileTypeDetector extends AbstractFileTypeDetector {
+
+    // path to mime.types file
+    private final Path mimeTypesFile;
+
+    // map of extension to MIME type
+    private Map<String,String> mimeTypeMap;
+
+    // set to true when file loaded
+    private volatile boolean loaded;
+
+    public MimeTypesFileTypeDetector(Path filePath) {
+        mimeTypesFile = filePath;
+    }
+
+    @Override
+    protected String implProbeContentType(Path path) {
+        Path fn = path.getFileName();
+        if (fn == null)
+            return null;  // no file name
+
+        String ext = getExtension(fn.toString());
+        if (ext.isEmpty())
+            return null;  // no extension
+
+        loadMimeTypes();
+        if (mimeTypeMap == null || mimeTypeMap.isEmpty())
+            return null;
+
+        // Case-sensitive search
+        String mimeType;
+        do {
+            mimeType = mimeTypeMap.get(ext);
+            if (mimeType == null)
+                ext = getExtension(ext);
+        } while (mimeType == null && !ext.isEmpty());
+
+        return mimeType;
+    }
+
+    /**
+     * Parse the mime types file, and store the type-extension mappings into
+     * mimeTypeMap. The mime types file is not loaded until the first probe
+     * to achieve the lazy initialization. It adopts double-checked locking
+     * optimization to reduce the locking overhead.
+     */
+    private void loadMimeTypes() {
+        if (!loaded) {
+            synchronized (this) {
+                if (!loaded) {
+                    List<String> lines = AccessController.doPrivileged(
+                        new PrivilegedAction<>() {
+                            @Override
+                            public List<String> run() {
+                                try {
+                                    return Files.readAllLines(mimeTypesFile,
+                                                              Charset.defaultCharset());
+                                } catch (IOException ignore) {
+                                    return Collections.emptyList();
+                                }
+                            }
+                        });
+
+                    mimeTypeMap = new HashMap<>(lines.size());
+                    String entry = "";
+                    for (String line : lines) {
+                        entry += line;
+                        if (entry.endsWith("\\")) {
+                            entry = entry.substring(0, entry.length() - 1);
+                            continue;
+                        }
+                        parseMimeEntry(entry);
+                        entry = "";
+                    }
+                    if (!entry.isEmpty()) {
+                        parseMimeEntry(entry);
+                    }
+                    loaded = true;
+                }
+            }
+        }
+    }
+
+    /**
+     * Parse a mime-types entry, which can have the following formats.
+     * 1) Simple space-delimited format
+     * image/jpeg   jpeg jpg jpe JPG
+     *
+     * 2) Netscape key-value pair format
+     * type=application/x-java-jnlp-file desc="Java Web Start" exts="jnlp"
+     * or
+     * type=text/html exts=htm,html
+     */
+    private void parseMimeEntry(String entry) {
+        entry = entry.trim();
+        if (entry.isEmpty() || entry.charAt(0) == '#')
+            return;
+
+        entry = entry.replaceAll("\\s*#.*", "");
+        int equalIdx = entry.indexOf('=');
+        if (equalIdx > 0) {
+            // Parse a mime-types command having the key-value pair format
+            final String TYPEEQUAL = "type=";
+            String typeRegex = "\\b" + TYPEEQUAL +
+                    "(\"\\p{Graph}+?/\\p{Graph}+?\"|\\p{Graph}+/\\p{Graph}+\\b)";
+            Pattern typePattern = Pattern.compile(typeRegex);
+            Matcher typeMatcher = typePattern.matcher(entry);
+
+            if (typeMatcher.find()) {
+                String type = typeMatcher.group().substring(TYPEEQUAL.length());
+                if (type.charAt(0) == '"') {
+                    type = type.substring(1, type.length() - 1);
+                }
+
+                final String EXTEQUAL = "exts=";
+                String extRegex = "\\b" + EXTEQUAL +
+                        "(\"[\\p{Graph}\\p{Blank}]+?\"|\\p{Graph}+\\b)";
+                Pattern extPattern = Pattern.compile(extRegex);
+                Matcher extMatcher = extPattern.matcher(entry);
+
+                if (extMatcher.find()) {
+                    String exts =
+                            extMatcher.group().substring(EXTEQUAL.length());
+                    if (exts.charAt(0) == '"') {
+                        exts = exts.substring(1, exts.length() - 1);
+                    }
+                    String[] extList = exts.split("[\\p{Blank}\\p{Punct}]+");
+                    for (String ext : extList) {
+                        putIfAbsent(ext, type);
+                    }
+                }
+            }
+        } else {
+            // Parse a mime-types command having the space-delimited format
+            String[] elements = entry.split("\\s+");
+            int i = 1;
+            while (i < elements.length) {
+                putIfAbsent(elements[i++], elements[0]);
+            }
+        }
+    }
+
+    private void putIfAbsent(String key, String value) {
+        if (key != null && !key.isEmpty() &&
+            value != null && !value.isEmpty() &&
+            !mimeTypeMap.containsKey(key))
+        {
+            mimeTypeMap.put(key, value);
+        }
+    }
+}

src/java.base/unix/classes/sun/nio/fs/UnixChannelFactory.java

@@ -0,0 +1,294 @@
+/*
+ * Copyright (c) 2008, 2013, 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;
+
+import java.nio.file.*;
+import java.nio.channels.*;
+import java.io.FileDescriptor;
+import java.util.Set;
+
+import jdk.internal.misc.SharedSecrets;
+import jdk.internal.misc.JavaIOFileDescriptorAccess;
+import sun.nio.ch.FileChannelImpl;
+import sun.nio.ch.ThreadPool;
+import sun.nio.ch.SimpleAsynchronousFileChannelImpl;
+
+import static sun.nio.fs.UnixNativeDispatcher.*;
+import static sun.nio.fs.UnixConstants.*;
+
+/**
+ * Factory for FileChannels and AsynchronousFileChannels
+ */
+
+class UnixChannelFactory {
+    private static final JavaIOFileDescriptorAccess fdAccess =
+        SharedSecrets.getJavaIOFileDescriptorAccess();
+
+    protected UnixChannelFactory() {
+    }
+
+    /**
+     * Represents the flags from a user-supplied set of open options.
+     */
+    protected static class Flags {
+        boolean read;
+        boolean write;
+        boolean append;
+        boolean truncateExisting;
+        boolean noFollowLinks;
+        boolean create;
+        boolean createNew;
+        boolean deleteOnClose;
+        boolean sync;
+        boolean dsync;
+
+        static Flags toFlags(Set<? extends OpenOption> options) {
+            Flags flags = new Flags();
+            for (OpenOption option: options) {
+                if (option instanceof StandardOpenOption) {
+                    switch ((StandardOpenOption)option) {
+                        case READ : flags.read = true; break;
+                        case WRITE : flags.write = true; break;
+                        case APPEND : flags.append = true; break;
+                        case TRUNCATE_EXISTING : flags.truncateExisting = true; break;
+                        case CREATE : flags.create = true; break;
+                        case CREATE_NEW : flags.createNew = true; break;
+                        case DELETE_ON_CLOSE : flags.deleteOnClose = true; break;
+                        case SPARSE : /* ignore */ break;
+                        case SYNC : flags.sync = true; break;
+                        case DSYNC : flags.dsync = true; break;
+                        default: throw new UnsupportedOperationException();
+                    }
+                    continue;
+                }
+                if (option == LinkOption.NOFOLLOW_LINKS && O_NOFOLLOW != 0) {
+                    flags.noFollowLinks = true;
+                    continue;
+                }
+                if (option == null)
+                    throw new NullPointerException();
+               throw new UnsupportedOperationException(option + " not supported");
+            }
+            return flags;
+        }
+    }
+
+
+    /**
+     * Constructs a file channel from an existing (open) file descriptor
+     */
+    static FileChannel newFileChannel(int fd, String path, boolean reading, boolean writing) {
+        FileDescriptor fdObj = new FileDescriptor();
+        fdAccess.set(fdObj, fd);
+        return FileChannelImpl.open(fdObj, path, reading, writing, null);
+    }
+
+    /**
+     * Constructs a file channel by opening a file using a dfd/path pair
+     */
+    static FileChannel newFileChannel(int dfd,
+                                      UnixPath path,
+                                      String pathForPermissionCheck,
+                                      Set<? extends OpenOption> options,
+                                      int mode)
+        throws UnixException
+    {
+        Flags flags = Flags.toFlags(options);
+
+        // default is reading; append => writing
+        if (!flags.read && !flags.write) {
+            if (flags.append) {
+                flags.write = true;
+            } else {
+                flags.read = true;
+            }
+        }
+
+        // validation
+        if (flags.read && flags.append)
+            throw new IllegalArgumentException("READ + APPEND not allowed");
+        if (flags.append && flags.truncateExisting)
+            throw new IllegalArgumentException("APPEND + TRUNCATE_EXISTING not allowed");
+
+        FileDescriptor fdObj = open(dfd, path, pathForPermissionCheck, flags, mode);
+        return FileChannelImpl.open(fdObj, path.toString(), flags.read, flags.write, null);
+    }
+
+    /**
+     * Constructs a file channel by opening the given file.
+     */
+    static FileChannel newFileChannel(UnixPath path,
+                                      Set<? extends OpenOption> options,
+                                      int mode)
+        throws UnixException
+    {
+        return newFileChannel(-1, path, null, options, mode);
+    }
+
+    /**
+     * Constructs an asynchronous file channel by opening the given file.
+     */
+    static AsynchronousFileChannel newAsynchronousFileChannel(UnixPath path,
+                                                              Set<? extends OpenOption> options,
+                                                              int mode,
+                                                              ThreadPool pool)
+        throws UnixException
+    {
+        Flags flags = Flags.toFlags(options);
+
+        // default is reading
+        if (!flags.read && !flags.write) {
+            flags.read = true;
+        }
+
+        // validation
+        if (flags.append)
+            throw new UnsupportedOperationException("APPEND not allowed");
+
+        // for now use simple implementation
+        FileDescriptor fdObj = open(-1, path, null, flags, mode);
+        return SimpleAsynchronousFileChannelImpl.open(fdObj, flags.read, flags.write, pool);
+    }
+
+    /**
+     * Opens file based on parameters and options, returning a FileDescriptor
+     * encapsulating the handle to the open file.
+     */
+    protected static FileDescriptor open(int dfd,
+                                         UnixPath path,
+                                         String pathForPermissionCheck,
+                                         Flags flags,
+                                         int mode)
+        throws UnixException
+    {
+        // map to oflags
+        int oflags;
+        if (flags.read && flags.write) {
+            oflags = O_RDWR;
+        } else {
+            oflags = (flags.write) ? O_WRONLY : O_RDONLY;
+        }
+        if (flags.write) {
+            if (flags.truncateExisting)
+                oflags |= O_TRUNC;
+            if (flags.append)
+                oflags |= O_APPEND;
+
+            // create flags
+            if (flags.createNew) {
+                byte[] pathForSysCall = path.asByteArray();
+
+                // throw exception if file name is "." to avoid confusing error
+                if ((pathForSysCall[pathForSysCall.length-1] == '.') &&
+                    (pathForSysCall.length == 1 ||
+                    (pathForSysCall[pathForSysCall.length-2] == '/')))
+                {
+                    throw new UnixException(EEXIST);
+                }
+                oflags |= (O_CREAT | O_EXCL);
+            } else {
+                if (flags.create)
+                    oflags |= O_CREAT;
+            }
+        }
+
+        // follow links by default
+        boolean followLinks = true;
+        if (!flags.createNew && (flags.noFollowLinks || flags.deleteOnClose)) {
+            if (flags.deleteOnClose && O_NOFOLLOW == 0) {
+                try {
+                    if (UnixFileAttributes.get(path, false).isSymbolicLink())
+                        throw new UnixException("DELETE_ON_CLOSE specified and file is a symbolic link");
+                } catch (UnixException x) {
+                    if (!flags.create || x.errno() != ENOENT)
+                        throw x;
+                }
+            }
+            followLinks = false;
+            oflags |= O_NOFOLLOW;
+        }
+
+        if (flags.dsync)
+            oflags |= O_DSYNC;
+        if (flags.sync)
+            oflags |= O_SYNC;
+
+        // permission check before we open the file
+        SecurityManager sm = System.getSecurityManager();
+        if (sm != null) {
+            if (pathForPermissionCheck == null)
+                pathForPermissionCheck = path.getPathForPermissionCheck();
+            if (flags.read)
+                sm.checkRead(pathForPermissionCheck);
+            if (flags.write)
+                sm.checkWrite(pathForPermissionCheck);
+            if (flags.deleteOnClose)
+                sm.checkDelete(pathForPermissionCheck);
+        }
+
+        int fd;
+        try {
+            if (dfd >= 0) {
+                fd = openat(dfd, path.asByteArray(), oflags, mode);
+            } else {
+                fd = UnixNativeDispatcher.open(path, oflags, mode);
+            }
+        } catch (UnixException x) {
+            // Linux error can be EISDIR or EEXIST when file exists
+            if (flags.createNew && (x.errno() == EISDIR)) {
+                x.setError(EEXIST);
+            }
+
+            // handle ELOOP to avoid confusing message
+            if (!followLinks && (x.errno() == ELOOP)) {
+                x = new UnixException(x.getMessage() + " (NOFOLLOW_LINKS specified)");
+            }
+
+            throw x;
+        }
+
+        // unlink file immediately if delete on close. The spec is clear that
+        // an implementation cannot guarantee to unlink the correct file when
+        // replaced by an attacker after it is opened.
+        if (flags.deleteOnClose) {
+            try {
+                if (dfd >= 0) {
+                    unlinkat(dfd, path.asByteArray(), 0);
+                } else {
+                    unlink(path);
+                }
+            } catch (UnixException ignore) {
+                // best-effort
+            }
+        }
+
+        // create java.io.FileDescriptor
+        FileDescriptor fdObj = new FileDescriptor();
+        fdAccess.set(fdObj, fd);
+        fdAccess.setAppend(fdObj, flags.append);
+        return fdObj;
+    }
+}

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

@@ -0,0 +1,132 @@
+/*
+ * Copyright (c) 2008, 2016, 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.
+ *
+ */
+
+@@END_COPYRIGHT@@
+
+#include <stdio.h>
+#include <errno.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+
+/* On Solaris, "sun" is defined as a macro. Undefine to make package
+   declaration valid */
+#undef sun
+
+/* To be able to name the Java constants the same as the C constants without
+   having the preprocessor rewrite those identifiers, add PREFIX_ to all
+   identifiers matching a C constant. The PREFIX_ is filtered out in the
+   makefile. */
+
+@@START_HERE@@
+
+package sun.nio.fs;
+class UnixConstants {
+    private UnixConstants() { }
+    static final int PREFIX_O_RDONLY = O_RDONLY;
+    static final int PREFIX_O_WRONLY = O_WRONLY;
+    static final int PREFIX_O_RDWR = O_RDWR;
+    static final int PREFIX_O_APPEND = O_APPEND;
+    static final int PREFIX_O_CREAT = O_CREAT;
+    static final int PREFIX_O_EXCL = O_EXCL;
+    static final int PREFIX_O_TRUNC = O_TRUNC;
+    static final int PREFIX_O_SYNC = O_SYNC;
+
+#ifndef O_DSYNC
+    // At least FreeBSD doesn't define O_DSYNC
+    static final int PREFIX_O_DSYNC = O_SYNC;
+#else
+    static final int PREFIX_O_DSYNC = O_DSYNC;
+#endif
+
+#ifdef O_NOFOLLOW
+    static final int PREFIX_O_NOFOLLOW = O_NOFOLLOW;
+#else
+    // not supported (dummy values will not be used at runtime).
+    static final int PREFIX_O_NOFOLLOW = 00;
+#endif
+
+
+    static final int PREFIX_S_IAMB =
+        (S_IRUSR|S_IWUSR|S_IXUSR|S_IRGRP|S_IWGRP|S_IXGRP|S_IROTH|S_IWOTH|S_IXOTH);
+    static final int PREFIX_S_IRUSR = S_IRUSR;
+    static final int PREFIX_S_IWUSR = S_IWUSR;
+    static final int PREFIX_S_IXUSR = S_IXUSR;
+    static final int PREFIX_S_IRGRP = S_IRGRP;
+    static final int PREFIX_S_IWGRP = S_IWGRP;
+    static final int PREFIX_S_IXGRP = S_IXGRP;
+    static final int PREFIX_S_IROTH = S_IROTH;
+    static final int PREFIX_S_IWOTH = S_IWOTH;
+    static final int PREFIX_S_IXOTH = S_IXOTH;
+
+    static final int PREFIX_S_IFMT = S_IFMT;
+    static final int PREFIX_S_IFREG = S_IFREG;
+    static final int PREFIX_S_IFDIR = S_IFDIR;
+    static final int PREFIX_S_IFLNK = S_IFLNK;
+    static final int PREFIX_S_IFCHR = S_IFCHR;
+    static final int PREFIX_S_IFBLK = S_IFBLK;
+    static final int PREFIX_S_IFIFO = S_IFIFO;
+    static final int PREFIX_R_OK = R_OK;
+    static final int PREFIX_W_OK = W_OK;
+    static final int PREFIX_X_OK = X_OK;
+    static final int PREFIX_F_OK = F_OK;
+    static final int PREFIX_ENOENT = ENOENT;
+    static final int PREFIX_ENXIO = ENXIO;
+    static final int PREFIX_EACCES = EACCES;
+    static final int PREFIX_EEXIST = EEXIST;
+    static final int PREFIX_ENOTDIR = ENOTDIR;
+    static final int PREFIX_EINVAL = EINVAL;
+    static final int PREFIX_EXDEV = EXDEV;
+    static final int PREFIX_EISDIR = EISDIR;
+    static final int PREFIX_ENOTEMPTY = ENOTEMPTY;
+    static final int PREFIX_ENOSPC = ENOSPC;
+    static final int PREFIX_EAGAIN = EAGAIN;
+    static final int PREFIX_ENOSYS = ENOSYS;
+    static final int PREFIX_ELOOP = ELOOP;
+    static final int PREFIX_EROFS = EROFS;
+
+#ifndef ENODATA
+    // Only used in Linux java source, provide any value so it compiles
+    static final int PREFIX_ENODATA = ELAST;
+#else
+    static final int PREFIX_ENODATA = ENODATA;
+#endif
+
+    static final int PREFIX_ERANGE = ERANGE;
+    static final int PREFIX_EMFILE = EMFILE;
+
+    // flags used with openat/unlinkat/etc.
+#if defined(AT_SYMLINK_NOFOLLOW) && defined(AT_REMOVEDIR)
+    static final int PREFIX_AT_SYMLINK_NOFOLLOW = AT_SYMLINK_NOFOLLOW;
+    static final int PREFIX_AT_REMOVEDIR = AT_REMOVEDIR;
+#else
+    // not supported (dummy values will not be used at runtime).
+    static final int PREFIX_AT_SYMLINK_NOFOLLOW = 00;
+    static final int PREFIX_AT_REMOVEDIR = 00;
+#endif
+
+}

src/java.base/unix/classes/sun/nio/fs/UnixCopyFile.java

@@ -0,0 +1,622 @@
+/*
+ * Copyright (c) 2008, 2016, 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;
+
+import java.io.IOException;
+import java.nio.file.AtomicMoveNotSupportedException;
+import java.nio.file.CopyOption;
+import java.nio.file.DirectoryNotEmptyException;
+import java.nio.file.FileAlreadyExistsException;
+import java.nio.file.LinkOption;
+import java.nio.file.LinkPermission;
+import java.nio.file.StandardCopyOption;
+import java.security.AccessController;
+import java.security.PrivilegedAction;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.TimeUnit;
+
+import static sun.nio.fs.UnixNativeDispatcher.*;
+import static sun.nio.fs.UnixConstants.*;
+
+
+/**
+ * Unix implementation of Path#copyTo and Path#moveTo methods.
+ */
+
+class UnixCopyFile {
+    private UnixCopyFile() {  }
+
+    // The flags that control how a file is copied or moved
+    private static class Flags {
+        boolean replaceExisting;
+        boolean atomicMove;
+        boolean followLinks;
+        boolean interruptible;
+
+        // the attributes to copy
+        boolean copyBasicAttributes;
+        boolean copyPosixAttributes;
+        boolean copyNonPosixAttributes;
+
+        // flags that indicate if we should fail if attributes cannot be copied
+        boolean failIfUnableToCopyBasic;
+        boolean failIfUnableToCopyPosix;
+        boolean failIfUnableToCopyNonPosix;
+
+        static Flags fromCopyOptions(CopyOption... options) {
+            Flags flags = new Flags();
+            flags.followLinks = true;
+            for (CopyOption option: options) {
+                if (option == StandardCopyOption.REPLACE_EXISTING) {
+                    flags.replaceExisting = true;
+                    continue;
+                }
+                if (option == LinkOption.NOFOLLOW_LINKS) {
+                    flags.followLinks = false;
+                    continue;
+                }
+                if (option == StandardCopyOption.COPY_ATTRIBUTES) {
+                    // copy all attributes but only fail if basic attributes
+                    // cannot be copied
+                    flags.copyBasicAttributes = true;
+                    flags.copyPosixAttributes = true;
+                    flags.copyNonPosixAttributes = true;
+                    flags.failIfUnableToCopyBasic = true;
+                    continue;
+                }
+                if (ExtendedOptions.INTERRUPTIBLE.matches(option)) {
+                    flags.interruptible = true;
+                    continue;
+                }
+                if (option == null)
+                    throw new NullPointerException();
+                throw new UnsupportedOperationException("Unsupported copy option");
+            }
+            return flags;
+        }
+
+        static Flags fromMoveOptions(CopyOption... options) {
+            Flags flags = new Flags();
+            for (CopyOption option: options) {
+                if (option == StandardCopyOption.ATOMIC_MOVE) {
+                    flags.atomicMove = true;
+                    continue;
+                }
+                if (option == StandardCopyOption.REPLACE_EXISTING) {
+                    flags.replaceExisting = true;
+                    continue;
+                }
+                if (option == LinkOption.NOFOLLOW_LINKS) {
+                    // ignore
+                    continue;
+                }
+                if (option == null)
+                    throw new NullPointerException();
+                throw new UnsupportedOperationException("Unsupported copy option");
+            }
+
+            // a move requires that all attributes be copied but only fail if
+            // the basic attributes cannot be copied
+            flags.copyBasicAttributes = true;
+            flags.copyPosixAttributes = true;
+            flags.copyNonPosixAttributes = true;
+            flags.failIfUnableToCopyBasic = true;
+            return flags;
+        }
+    }
+
+    // copy directory from source to target
+    private static void copyDirectory(UnixPath source,
+                                      UnixFileAttributes attrs,
+                                      UnixPath target,
+                                      Flags flags)
+        throws IOException
+    {
+        try {
+            mkdir(target, attrs.mode());
+        } catch (UnixException x) {
+            x.rethrowAsIOException(target);
+        }
+
+        // no attributes to copy
+        if (!flags.copyBasicAttributes &&
+            !flags.copyPosixAttributes &&
+            !flags.copyNonPosixAttributes) return;
+
+        // open target directory if possible (this can fail when copying a
+        // directory for which we don't have read access).
+        int dfd = -1;
+        try {
+            dfd = open(target, O_RDONLY, 0);
+        } catch (UnixException x) {
+            // access to target directory required to copy named attributes
+            if (flags.copyNonPosixAttributes && flags.failIfUnableToCopyNonPosix) {
+                try { rmdir(target); } catch (UnixException ignore) { }
+                x.rethrowAsIOException(target);
+            }
+        }
+
+        boolean done = false;
+        try {
+            // copy owner/group/permissions
+            if (flags.copyPosixAttributes){
+                try {
+                    if (dfd >= 0) {
+                        fchown(dfd, attrs.uid(), attrs.gid());
+                        fchmod(dfd, attrs.mode());
+                    } else {
+                        chown(target, attrs.uid(), attrs.gid());
+                        chmod(target, attrs.mode());
+                    }
+                } catch (UnixException x) {
+                    // unable to set owner/group
+                    if (flags.failIfUnableToCopyPosix)
+                        x.rethrowAsIOException(target);
+                }
+            }
+            // copy other attributes
+            if (flags.copyNonPosixAttributes && (dfd >= 0)) {
+                int sfd = -1;
+                try {
+                    sfd = open(source, O_RDONLY, 0);
+                } catch (UnixException x) {
+                    if (flags.failIfUnableToCopyNonPosix)
+                        x.rethrowAsIOException(source);
+                }
+                if (sfd >= 0) {
+                    source.getFileSystem().copyNonPosixAttributes(sfd, dfd);
+                    close(sfd);
+                }
+            }
+            // copy time stamps last
+            if (flags.copyBasicAttributes) {
+                try {
+                    if (dfd >= 0 && futimesSupported()) {
+                        futimes(dfd,
+                                attrs.lastAccessTime().to(TimeUnit.MICROSECONDS),
+                                attrs.lastModifiedTime().to(TimeUnit.MICROSECONDS));
+                    } else {
+                        utimes(target,
+                               attrs.lastAccessTime().to(TimeUnit.MICROSECONDS),
+                               attrs.lastModifiedTime().to(TimeUnit.MICROSECONDS));
+                    }
+                } catch (UnixException x) {
+                    // unable to set times
+                    if (flags.failIfUnableToCopyBasic)
+                        x.rethrowAsIOException(target);
+                }
+            }
+            done = true;
+        } finally {
+            if (dfd >= 0)
+                close(dfd);
+            if (!done) {
+                // rollback
+                try { rmdir(target); } catch (UnixException ignore) { }
+            }
+        }
+    }
+
+    // copy regular file from source to target
+    private static void copyFile(UnixPath source,
+                                 UnixFileAttributes attrs,
+                                 UnixPath  target,
+                                 Flags flags,
+                                 long addressToPollForCancel)
+        throws IOException
+    {
+        int fi = -1;
+        try {
+            fi = open(source, O_RDONLY, 0);
+        } catch (UnixException x) {
+            x.rethrowAsIOException(source);
+        }
+
+        try {
+            // open new file
+            int fo = -1;
+            try {
+                fo = open(target,
+                           (O_WRONLY |
+                            O_CREAT |
+                            O_EXCL),
+                           attrs.mode());
+            } catch (UnixException x) {
+                x.rethrowAsIOException(target);
+            }
+
+            // set to true when file and attributes copied
+            boolean complete = false;
+            try {
+                // transfer bytes to target file
+                try {
+                    transfer(fo, fi, addressToPollForCancel);
+                } catch (UnixException x) {
+                    x.rethrowAsIOException(source, target);
+                }
+                // copy owner/permissions
+                if (flags.copyPosixAttributes) {
+                    try {
+                        fchown(fo, attrs.uid(), attrs.gid());
+                        fchmod(fo, attrs.mode());
+                    } catch (UnixException x) {
+                        if (flags.failIfUnableToCopyPosix)
+                            x.rethrowAsIOException(target);
+                    }
+                }
+                // copy non POSIX attributes (depends on file system)
+                if (flags.copyNonPosixAttributes) {
+                    source.getFileSystem().copyNonPosixAttributes(fi, fo);
+                }
+                // copy time attributes
+                if (flags.copyBasicAttributes) {
+                    try {
+                        if (futimesSupported()) {
+                            futimes(fo,
+                                    attrs.lastAccessTime().to(TimeUnit.MICROSECONDS),
+                                    attrs.lastModifiedTime().to(TimeUnit.MICROSECONDS));
+                        } else {
+                            utimes(target,
+                                   attrs.lastAccessTime().to(TimeUnit.MICROSECONDS),
+                                   attrs.lastModifiedTime().to(TimeUnit.MICROSECONDS));
+                        }
+                    } catch (UnixException x) {
+                        if (flags.failIfUnableToCopyBasic)
+                            x.rethrowAsIOException(target);
+                    }
+                }
+                complete = true;
+            } finally {
+                close(fo);
+
+                // copy of file or attributes failed so rollback
+                if (!complete) {
+                    try {
+                        unlink(target);
+                    } catch (UnixException ignore) { }
+                }
+            }
+        } finally {
+            close(fi);
+        }
+    }
+
+    // copy symbolic link from source to target
+    private static void copyLink(UnixPath source,
+                                 UnixFileAttributes attrs,
+                                 UnixPath  target,
+                                 Flags flags)
+        throws IOException
+    {
+        byte[] linktarget = null;
+        try {
+            linktarget = readlink(source);
+        } catch (UnixException x) {
+            x.rethrowAsIOException(source);
+        }
+        try {
+            symlink(linktarget, target);
+
+            if (flags.copyPosixAttributes) {
+                try {
+                    lchown(target, attrs.uid(), attrs.gid());
+                } catch (UnixException x) {
+                    // ignore since link attributes not required to be copied
+                }
+            }
+        } catch (UnixException x) {
+            x.rethrowAsIOException(target);
+        }
+    }
+
+    // copy special file from source to target
+    private static void copySpecial(UnixPath source,
+                                    UnixFileAttributes attrs,
+                                    UnixPath  target,
+                                    Flags flags)
+        throws IOException
+    {
+        try {
+            mknod(target, attrs.mode(), attrs.rdev());
+        } catch (UnixException x) {
+            x.rethrowAsIOException(target);
+        }
+        boolean done = false;
+        try {
+            if (flags.copyPosixAttributes) {
+                try {
+                    chown(target, attrs.uid(), attrs.gid());
+                    chmod(target, attrs.mode());
+                } catch (UnixException x) {
+                    if (flags.failIfUnableToCopyPosix)
+                        x.rethrowAsIOException(target);
+                }
+            }
+            if (flags.copyBasicAttributes) {
+                try {
+                    utimes(target,
+                           attrs.lastAccessTime().to(TimeUnit.MICROSECONDS),
+                           attrs.lastModifiedTime().to(TimeUnit.MICROSECONDS));
+                } catch (UnixException x) {
+                    if (flags.failIfUnableToCopyBasic)
+                        x.rethrowAsIOException(target);
+                }
+            }
+            done = true;
+        } finally {
+            if (!done) {
+                try { unlink(target); } catch (UnixException ignore) { }
+            }
+        }
+    }
+
+    // move file from source to target
+    static void move(UnixPath source, UnixPath target, CopyOption... options)
+        throws IOException
+    {
+        // permission check
+        SecurityManager sm = System.getSecurityManager();
+        if (sm != null) {
+            source.checkWrite();
+            target.checkWrite();
+        }
+
+        // translate options into flags
+        Flags flags = Flags.fromMoveOptions(options);
+
+        // handle atomic rename case
+        if (flags.atomicMove) {
+            try {
+                rename(source, target);
+            } catch (UnixException x) {
+                if (x.errno() == EXDEV) {
+                    throw new AtomicMoveNotSupportedException(
+                        source.getPathForExceptionMessage(),
+                        target.getPathForExceptionMessage(),
+                        x.errorString());
+                }
+                x.rethrowAsIOException(source, target);
+            }
+            return;
+        }
+
+        // move using rename or copy+delete
+        UnixFileAttributes sourceAttrs = null;
+        UnixFileAttributes targetAttrs = null;
+
+        // get attributes of source file (don't follow links)
+        try {
+            sourceAttrs = UnixFileAttributes.get(source, false);
+        } catch (UnixException x) {
+            x.rethrowAsIOException(source);
+        }
+
+        // get attributes of target file (don't follow links)
+        try {
+            targetAttrs = UnixFileAttributes.get(target, false);
+        } catch (UnixException x) {
+            // ignore
+        }
+        boolean targetExists = (targetAttrs != null);
+
+        // if the target exists:
+        // 1. check if source and target are the same file
+        // 2. throw exception if REPLACE_EXISTING option is not set
+        // 3. delete target if REPLACE_EXISTING option set
+        if (targetExists) {
+            if (sourceAttrs.isSameFile(targetAttrs))
+                return;  // nothing to do as files are identical
+            if (!flags.replaceExisting) {
+                throw new FileAlreadyExistsException(
+                    target.getPathForExceptionMessage());
+            }
+
+            // attempt to delete target
+            try {
+                if (targetAttrs.isDirectory()) {
+                    rmdir(target);
+                } else {
+                    unlink(target);
+                }
+            } catch (UnixException x) {
+                // target is non-empty directory that can't be replaced.
+                if (targetAttrs.isDirectory() &&
+                   (x.errno() == EEXIST || x.errno() == ENOTEMPTY))
+                {
+                    throw new DirectoryNotEmptyException(
+                        target.getPathForExceptionMessage());
+                }
+                x.rethrowAsIOException(target);
+            }
+        }
+
+        // first try rename
+        try {
+            rename(source, target);
+            return;
+        } catch (UnixException x) {
+            if (x.errno() != EXDEV && x.errno() != EISDIR) {
+                x.rethrowAsIOException(source, target);
+            }
+        }
+
+        // copy source to target
+        if (sourceAttrs.isDirectory()) {
+            copyDirectory(source, sourceAttrs, target, flags);
+        } else {
+            if (sourceAttrs.isSymbolicLink()) {
+                copyLink(source, sourceAttrs, target, flags);
+            } else {
+                if (sourceAttrs.isDevice()) {
+                    copySpecial(source, sourceAttrs, target, flags);
+                } else {
+                    copyFile(source, sourceAttrs, target, flags, 0L);
+                }
+            }
+        }
+
+        // delete source
+        try {
+            if (sourceAttrs.isDirectory()) {
+                rmdir(source);
+            } else {
+                unlink(source);
+            }
+        } catch (UnixException x) {
+            // file was copied but unable to unlink the source file so attempt
+            // to remove the target and throw a reasonable exception
+            try {
+                if (sourceAttrs.isDirectory()) {
+                    rmdir(target);
+                } else {
+                    unlink(target);
+                }
+            } catch (UnixException ignore) { }
+
+            if (sourceAttrs.isDirectory() &&
+                (x.errno() == EEXIST || x.errno() == ENOTEMPTY))
+            {
+                throw new DirectoryNotEmptyException(
+                    source.getPathForExceptionMessage());
+            }
+            x.rethrowAsIOException(source);
+        }
+    }
+
+    // copy file from source to target
+    static void copy(final UnixPath source,
+                     final UnixPath target,
+                     CopyOption... options) throws IOException
+    {
+        // permission checks
+        SecurityManager sm = System.getSecurityManager();
+        if (sm != null) {
+            source.checkRead();
+            target.checkWrite();
+        }
+
+        // translate options into flags
+        final Flags flags = Flags.fromCopyOptions(options);
+
+        UnixFileAttributes sourceAttrs = null;
+        UnixFileAttributes targetAttrs = null;
+
+        // get attributes of source file
+        try {
+            sourceAttrs = UnixFileAttributes.get(source, flags.followLinks);
+        } catch (UnixException x) {
+            x.rethrowAsIOException(source);
+        }
+
+        // if source file is symbolic link then we must check LinkPermission
+        if (sm != null && sourceAttrs.isSymbolicLink()) {
+            sm.checkPermission(new LinkPermission("symbolic"));
+        }
+
+        // get attributes of target file (don't follow links)
+        try {
+            targetAttrs = UnixFileAttributes.get(target, false);
+        } catch (UnixException x) {
+            // ignore
+        }
+        boolean targetExists = (targetAttrs != null);
+
+        // if the target exists:
+        // 1. check if source and target are the same file
+        // 2. throw exception if REPLACE_EXISTING option is not set
+        // 3. try to unlink the target
+        if (targetExists) {
+            if (sourceAttrs.isSameFile(targetAttrs))
+                return;  // nothing to do as files are identical
+            if (!flags.replaceExisting)
+                throw new FileAlreadyExistsException(
+                    target.getPathForExceptionMessage());
+            try {
+                if (targetAttrs.isDirectory()) {
+                    rmdir(target);
+                } else {
+                    unlink(target);
+                }
+            } catch (UnixException x) {
+                // target is non-empty directory that can't be replaced.
+                if (targetAttrs.isDirectory() &&
+                   (x.errno() == EEXIST || x.errno() == ENOTEMPTY))
+                {
+                    throw new DirectoryNotEmptyException(
+                        target.getPathForExceptionMessage());
+                }
+                x.rethrowAsIOException(target);
+            }
+        }
+
+        // do the copy
+        if (sourceAttrs.isDirectory()) {
+            copyDirectory(source, sourceAttrs, target, flags);
+            return;
+        }
+        if (sourceAttrs.isSymbolicLink()) {
+            copyLink(source, sourceAttrs, target, flags);
+            return;
+        }
+        if (!flags.interruptible) {
+            // non-interruptible file copy
+            copyFile(source, sourceAttrs, target, flags, 0L);
+            return;
+        }
+
+        // interruptible file copy
+        final UnixFileAttributes attrsToCopy = sourceAttrs;
+        Cancellable copyTask = new Cancellable() {
+            @Override public void implRun() throws IOException {
+                copyFile(source, attrsToCopy, target, flags,
+                    addressToPollForCancel());
+            }
+        };
+        try {
+            Cancellable.runInterruptibly(copyTask);
+        } catch (ExecutionException e) {
+            Throwable t = e.getCause();
+            if (t instanceof IOException)
+                throw (IOException)t;
+            throw new IOException(t);
+        }
+    }
+
+    // -- native methods --
+
+    static native void transfer(int dst, int src, long addressToPollForCancel)
+        throws UnixException;
+
+    static {
+        AccessController.doPrivileged(new PrivilegedAction<>() {
+            @Override
+            public Void run() {
+                System.loadLibrary("nio");
+                return null;
+            }});
+    }
+
+}

src/java.base/unix/classes/sun/nio/fs/UnixDirectoryStream.java

@@ -0,0 +1,221 @@
+/*
+ * Copyright (c) 2008, 2016, 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;
+
+import java.nio.file.*;
+import java.util.Iterator;
+import java.util.NoSuchElementException;
+import java.util.concurrent.locks.*;
+import java.io.IOException;
+import static sun.nio.fs.UnixNativeDispatcher.*;
+
+/**
+ * Unix implementation of java.nio.file.DirectoryStream
+ */
+
+class UnixDirectoryStream
+    implements DirectoryStream<Path>
+{
+    // path to directory when originally opened
+    private final UnixPath dir;
+
+    // directory pointer (returned by opendir)
+    private final long dp;
+
+    // filter (may be null)
+    private final DirectoryStream.Filter<? super Path> filter;
+
+    // used to coordinate closing of directory stream
+    private final ReentrantReadWriteLock streamLock =
+        new ReentrantReadWriteLock(true);
+
+    // indicates if directory stream is open (synchronize on closeLock)
+    private volatile boolean isClosed;
+
+    // directory iterator
+    private Iterator<Path> iterator;
+
+    /**
+     * Initializes a new instance
+     */
+    UnixDirectoryStream(UnixPath dir, long dp, DirectoryStream.Filter<? super Path> filter) {
+        this.dir = dir;
+        this.dp = dp;
+        this.filter = filter;
+    }
+
+    protected final UnixPath directory() {
+        return dir;
+    }
+
+    protected final Lock readLock() {
+        return streamLock.readLock();
+    }
+
+    protected final Lock writeLock() {
+        return streamLock.writeLock();
+    }
+
+    protected final boolean isOpen() {
+        return !isClosed;
+    }
+
+    protected final boolean closeImpl() throws IOException {
+        if (!isClosed) {
+            isClosed = true;
+            try {
+                closedir(dp);
+            } catch (UnixException x) {
+                throw new IOException(x.errorString());
+            }
+            return true;
+        } else {
+            return false;
+        }
+    }
+
+    @Override
+    public void close()
+        throws IOException
+    {
+        writeLock().lock();
+        try {
+            closeImpl();
+        } finally {
+            writeLock().unlock();
+        }
+    }
+
+    protected final Iterator<Path> iterator(DirectoryStream<Path> ds) {
+        if (isClosed) {
+            throw new IllegalStateException("Directory stream is closed");
+        }
+        synchronized (this) {
+            if (iterator != null)
+                throw new IllegalStateException("Iterator already obtained");
+            iterator = new UnixDirectoryIterator();
+            return iterator;
+        }
+    }
+
+    @Override
+    public Iterator<Path> iterator() {
+        return iterator(this);
+    }
+
+    /**
+     * Iterator implementation
+     */
+    private class UnixDirectoryIterator implements Iterator<Path> {
+        // true when at EOF
+        private boolean atEof;
+
+        // next entry to return
+        private Path nextEntry;
+
+        UnixDirectoryIterator() {
+            atEof = false;
+        }
+
+        // Return true if file name is "." or ".."
+        private boolean isSelfOrParent(byte[] nameAsBytes) {
+            if (nameAsBytes[0] == '.') {
+                if ((nameAsBytes.length == 1) ||
+                    (nameAsBytes.length == 2 && nameAsBytes[1] == '.')) {
+                    return true;
+                }
+            }
+            return false;
+        }
+
+        // Returns next entry (or null)
+        private Path readNextEntry() {
+            assert Thread.holdsLock(this);
+
+            for (;;) {
+                byte[] nameAsBytes = null;
+
+                // prevent close while reading
+                readLock().lock();
+                try {
+                    if (isOpen()) {
+                        nameAsBytes = readdir(dp);
+                    }
+                } catch (UnixException x) {
+                    IOException ioe = x.asIOException(dir);
+                    throw new DirectoryIteratorException(ioe);
+                } finally {
+                    readLock().unlock();
+                }
+
+                // EOF
+                if (nameAsBytes == null) {
+                    atEof = true;
+                    return null;
+                }
+
+                // ignore "." and ".."
+                if (!isSelfOrParent(nameAsBytes)) {
+                    Path entry = dir.resolve(nameAsBytes);
+
+                    // return entry if no filter or filter accepts it
+                    try {
+                        if (filter == null || filter.accept(entry))
+                            return entry;
+                    } catch (IOException ioe) {
+                        throw new DirectoryIteratorException(ioe);
+                    }
+                }
+            }
+        }
+
+        @Override
+        public synchronized boolean hasNext() {
+            if (nextEntry == null && !atEof)
+                nextEntry = readNextEntry();
+            return nextEntry != null;
+        }
+
+        @Override
+        public synchronized Path next() {
+            Path result;
+            if (nextEntry == null && !atEof) {
+                result = readNextEntry();
+            } else {
+                result = nextEntry;
+                nextEntry = null;
+            }
+            if (result == null)
+                throw new NoSuchElementException();
+            return result;
+        }
+
+        @Override
+        public void remove() {
+            throw new UnsupportedOperationException();
+        }
+    }
+}

src/java.base/unix/classes/sun/nio/fs/UnixException.java

@@ -0,0 +1,122 @@
+/*
+ * Copyright (c) 2008, 2016, 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;
+
+import java.nio.file.*;
+import java.io.IOException;
+
+/**
+ * Internal exception thrown by native methods when error detected.
+ */
+
+class UnixException extends Exception {
+    static final long serialVersionUID = 7227016794320723218L;
+
+    private int errno;
+    private String msg;
+
+    UnixException(int errno) {
+        this.errno = errno;
+        this.msg = null;
+    }
+
+    UnixException(String msg) {
+        this.errno = 0;
+        this.msg = msg;
+    }
+
+    int errno() {
+        return errno;
+    }
+
+    void setError(int errno) {
+        this.errno = errno;
+        this.msg = null;
+    }
+
+    String errorString() {
+        if (msg != null) {
+            return msg;
+        } else {
+            return Util.toString(UnixNativeDispatcher.strerror(errno()));
+        }
+    }
+
+    @Override
+    public String getMessage() {
+        return errorString();
+    }
+
+    @Override
+    public Throwable fillInStackTrace() {
+        // This is an internal exception; the stack trace is irrelevant.
+        return this;
+    }
+
+    /**
+     * Map well known errors to specific exceptions where possible; otherwise
+     * return more general FileSystemException.
+     */
+    private IOException translateToIOException(String file, String other) {
+        // created with message rather than errno
+        if (msg != null)
+            return new IOException(msg);
+
+        // handle specific cases
+        if (errno() == UnixConstants.EACCES)
+            return new AccessDeniedException(file, other, null);
+        if (errno() == UnixConstants.ENOENT)
+            return new NoSuchFileException(file, other, null);
+        if (errno() == UnixConstants.EEXIST)
+            return new FileAlreadyExistsException(file, other, null);
+        if (errno() == UnixConstants.ELOOP)
+            return new FileSystemException(file, other, errorString()
+                + " or unable to access attributes of symbolic link");
+
+        // fallback to the more general exception
+        return new FileSystemException(file, other, errorString());
+    }
+
+    void rethrowAsIOException(String file) throws IOException {
+        IOException x = translateToIOException(file, null);
+        throw x;
+    }
+
+    void rethrowAsIOException(UnixPath file, UnixPath other) throws IOException {
+        String a = (file == null) ? null : file.getPathForExceptionMessage();
+        String b = (other == null) ? null : other.getPathForExceptionMessage();
+        IOException x = translateToIOException(a, b);
+        throw x;
+    }
+
+    void rethrowAsIOException(UnixPath file) throws IOException {
+        rethrowAsIOException(file, null);
+    }
+
+    IOException asIOException(UnixPath file) {
+        return translateToIOException(file.getPathForExceptionMessage(), null);
+    }
+}

src/java.base/unix/classes/sun/nio/fs/UnixFileAttributeViews.java

@@ -0,0 +1,398 @@
+/*
+ * Copyright (c) 2008, 2015, 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;
+
+import java.nio.file.*;
+import java.nio.file.attribute.*;
+import java.util.*;
+import java.util.concurrent.TimeUnit;
+import java.io.IOException;
+
+import static sun.nio.fs.UnixNativeDispatcher.*;
+
+class UnixFileAttributeViews {
+
+    static class Basic extends AbstractBasicFileAttributeView {
+        protected final UnixPath file;
+        protected final boolean followLinks;
+
+        Basic(UnixPath file, boolean followLinks) {
+            this.file = file;
+            this.followLinks = followLinks;
+        }
+
+        @Override
+        public BasicFileAttributes readAttributes() throws IOException {
+            file.checkRead();
+            try {
+                 UnixFileAttributes attrs =
+                     UnixFileAttributes.get(file, followLinks);
+                 return attrs.asBasicFileAttributes();
+            } catch (UnixException x) {
+                x.rethrowAsIOException(file);
+                return null;    // keep compiler happy
+            }
+        }
+
+        @Override
+        public void setTimes(FileTime lastModifiedTime,
+                             FileTime lastAccessTime,
+                             FileTime createTime) throws IOException
+        {
+            // null => don't change
+            if (lastModifiedTime == null && lastAccessTime == null) {
+                // no effect
+                return;
+            }
+
+            // permission check
+            file.checkWrite();
+
+            boolean haveFd = false;
+            boolean useFutimes = false;
+            int fd = -1;
+            try {
+                fd = file.openForAttributeAccess(followLinks);
+                if (fd != -1) {
+                    haveFd = true;
+                    useFutimes = futimesSupported();
+                }
+            } catch (UnixException x) {
+                if (x.errno() != UnixConstants.ENXIO) {
+                    x.rethrowAsIOException(file);
+                }
+            }
+
+            try {
+                // assert followLinks || !UnixFileAttributes.get(fd).isSymbolicLink();
+
+                // if not changing both attributes then need existing attributes
+                if (lastModifiedTime == null || lastAccessTime == null) {
+                    try {
+                        UnixFileAttributes attrs = haveFd ?
+                            UnixFileAttributes.get(fd) :
+                            UnixFileAttributes.get(file, followLinks);
+                        if (lastModifiedTime == null)
+                            lastModifiedTime = attrs.lastModifiedTime();
+                        if (lastAccessTime == null)
+                            lastAccessTime = attrs.lastAccessTime();
+                    } catch (UnixException x) {
+                        x.rethrowAsIOException(file);
+                    }
+                }
+
+                // uptime times
+                long modValue = lastModifiedTime.to(TimeUnit.MICROSECONDS);
+                long accessValue= lastAccessTime.to(TimeUnit.MICROSECONDS);
+
+                boolean retry = false;
+                try {
+                    if (useFutimes) {
+                        futimes(fd, accessValue, modValue);
+                    } else {
+                        utimes(file, accessValue, modValue);
+                    }
+                } catch (UnixException x) {
+                    // if futimes/utimes fails with EINVAL and one/both of the times is
+                    // negative then we adjust the value to the epoch and retry.
+                    if (x.errno() == UnixConstants.EINVAL &&
+                        (modValue < 0L || accessValue < 0L)) {
+                        retry = true;
+                    } else {
+                        x.rethrowAsIOException(file);
+                    }
+                }
+                if (retry) {
+                    if (modValue < 0L) modValue = 0L;
+                    if (accessValue < 0L) accessValue= 0L;
+                    try {
+                        if (useFutimes) {
+                            futimes(fd, accessValue, modValue);
+                        } else {
+                            utimes(file, accessValue, modValue);
+                        }
+                    } catch (UnixException x) {
+                        x.rethrowAsIOException(file);
+                    }
+                }
+            } finally {
+                close(fd);
+            }
+        }
+    }
+
+    private static class Posix extends Basic implements PosixFileAttributeView {
+        private static final String PERMISSIONS_NAME = "permissions";
+        private static final String OWNER_NAME = "owner";
+        private static final String GROUP_NAME = "group";
+
+        // the names of the posix attributes (includes basic)
+        static final Set<String> posixAttributeNames =
+            Util.newSet(basicAttributeNames, PERMISSIONS_NAME, OWNER_NAME, GROUP_NAME);
+
+        Posix(UnixPath file, boolean followLinks) {
+            super(file, followLinks);
+        }
+
+        final void checkReadExtended() {
+            SecurityManager sm = System.getSecurityManager();
+            if (sm != null) {
+                file.checkRead();
+                sm.checkPermission(new RuntimePermission("accessUserInformation"));
+            }
+        }
+
+        final void checkWriteExtended() {
+            SecurityManager sm = System.getSecurityManager();
+            if (sm != null) {
+                file.checkWrite();
+                sm.checkPermission(new RuntimePermission("accessUserInformation"));
+            }
+        }
+
+        @Override
+        public String name() {
+            return "posix";
+        }
+
+        @Override
+        @SuppressWarnings("unchecked")
+        public void setAttribute(String attribute, Object value)
+            throws IOException
+        {
+            if (attribute.equals(PERMISSIONS_NAME)) {
+                setPermissions((Set<PosixFilePermission>)value);
+                return;
+            }
+            if (attribute.equals(OWNER_NAME)) {
+                setOwner((UserPrincipal)value);
+                return;
+            }
+            if (attribute.equals(GROUP_NAME)) {
+                setGroup((GroupPrincipal)value);
+                return;
+            }
+            super.setAttribute(attribute, value);
+        }
+
+        /**
+         * Invoked by readAttributes or sub-classes to add all matching posix
+         * attributes to the builder
+         */
+        final void addRequestedPosixAttributes(PosixFileAttributes attrs,
+                                               AttributesBuilder builder)
+        {
+            addRequestedBasicAttributes(attrs, builder);
+            if (builder.match(PERMISSIONS_NAME))
+                builder.add(PERMISSIONS_NAME, attrs.permissions());
+            if (builder.match(OWNER_NAME))
+                 builder.add(OWNER_NAME, attrs.owner());
+            if (builder.match(GROUP_NAME))
+                builder.add(GROUP_NAME, attrs.group());
+        }
+
+        @Override
+        public Map<String,Object> readAttributes(String[] requested)
+            throws IOException
+        {
+            AttributesBuilder builder =
+                AttributesBuilder.create(posixAttributeNames, requested);
+            PosixFileAttributes attrs = readAttributes();
+            addRequestedPosixAttributes(attrs, builder);
+            return builder.unmodifiableMap();
+        }
+
+        @Override
+        public UnixFileAttributes readAttributes() throws IOException {
+            checkReadExtended();
+            try {
+                 return UnixFileAttributes.get(file, followLinks);
+            } catch (UnixException x) {
+                x.rethrowAsIOException(file);
+                return null;    // keep compiler happy
+            }
+        }
+
+        // chmod
+        final void setMode(int mode) throws IOException {
+            checkWriteExtended();
+            try {
+                if (followLinks) {
+                    chmod(file, mode);
+                } else {
+                    int fd = file.openForAttributeAccess(false);
+                    try {
+                        fchmod(fd, mode);
+                    } finally {
+                        close(fd);
+                    }
+                }
+            } catch (UnixException x) {
+                x.rethrowAsIOException(file);
+            }
+        }
+
+        // chown
+        final void setOwners(int uid, int gid) throws IOException {
+            checkWriteExtended();
+            try {
+                if (followLinks) {
+                    chown(file, uid, gid);
+                } else {
+                    lchown(file, uid, gid);
+                }
+            } catch (UnixException x) {
+                x.rethrowAsIOException(file);
+            }
+        }
+
+        @Override
+        public void setPermissions(Set<PosixFilePermission> perms)
+            throws IOException
+        {
+            setMode(UnixFileModeAttribute.toUnixMode(perms));
+        }
+
+        @Override
+        public void setOwner(UserPrincipal owner)
+            throws IOException
+        {
+            if (owner == null)
+                throw new NullPointerException("'owner' is null");
+            if (!(owner instanceof UnixUserPrincipals.User))
+                throw new ProviderMismatchException();
+            if (owner instanceof UnixUserPrincipals.Group)
+                throw new IOException("'owner' parameter can't be a group");
+            int uid = ((UnixUserPrincipals.User)owner).uid();
+            setOwners(uid, -1);
+        }
+
+        @Override
+        public UserPrincipal getOwner() throws IOException {
+            return readAttributes().owner();
+        }
+
+        @Override
+        public void setGroup(GroupPrincipal group)
+            throws IOException
+        {
+            if (group == null)
+                throw new NullPointerException("'owner' is null");
+            if (!(group instanceof UnixUserPrincipals.Group))
+                throw new ProviderMismatchException();
+            int gid = ((UnixUserPrincipals.Group)group).gid();
+            setOwners(-1, gid);
+        }
+    }
+
+    private static class Unix extends Posix {
+        private static final String MODE_NAME = "mode";
+        private static final String INO_NAME = "ino";
+        private static final String DEV_NAME = "dev";
+        private static final String RDEV_NAME = "rdev";
+        private static final String NLINK_NAME = "nlink";
+        private static final String UID_NAME = "uid";
+        private static final String GID_NAME = "gid";
+        private static final String CTIME_NAME = "ctime";
+
+        // the names of the unix attributes (including posix)
+        static final Set<String> unixAttributeNames =
+            Util.newSet(posixAttributeNames,
+                        MODE_NAME, INO_NAME, DEV_NAME, RDEV_NAME,
+                        NLINK_NAME, UID_NAME, GID_NAME, CTIME_NAME);
+
+        Unix(UnixPath file, boolean followLinks) {
+            super(file, followLinks);
+        }
+
+        @Override
+        public String name() {
+            return "unix";
+        }
+
+        @Override
+        public void setAttribute(String attribute, Object value)
+            throws IOException
+        {
+            if (attribute.equals(MODE_NAME)) {
+                setMode((Integer)value);
+                return;
+            }
+            if (attribute.equals(UID_NAME)) {
+                setOwners((Integer)value, -1);
+                return;
+            }
+            if (attribute.equals(GID_NAME)) {
+                setOwners(-1, (Integer)value);
+                return;
+            }
+            super.setAttribute(attribute, value);
+        }
+
+        @Override
+        public Map<String,Object> readAttributes(String[] requested)
+            throws IOException
+        {
+            AttributesBuilder builder =
+                AttributesBuilder.create(unixAttributeNames, requested);
+            UnixFileAttributes attrs = readAttributes();
+            addRequestedPosixAttributes(attrs, builder);
+            if (builder.match(MODE_NAME))
+                builder.add(MODE_NAME, attrs.mode());
+            if (builder.match(INO_NAME))
+                builder.add(INO_NAME, attrs.ino());
+            if (builder.match(DEV_NAME))
+                builder.add(DEV_NAME, attrs.dev());
+            if (builder.match(RDEV_NAME))
+                builder.add(RDEV_NAME, attrs.rdev());
+            if (builder.match(NLINK_NAME))
+                builder.add(NLINK_NAME, attrs.nlink());
+            if (builder.match(UID_NAME))
+                builder.add(UID_NAME, attrs.uid());
+            if (builder.match(GID_NAME))
+                builder.add(GID_NAME, attrs.gid());
+            if (builder.match(CTIME_NAME))
+                builder.add(CTIME_NAME, attrs.ctime());
+            return builder.unmodifiableMap();
+        }
+    }
+
+    static Basic createBasicView(UnixPath file, boolean followLinks) {
+        return new Basic(file, followLinks);
+    }
+
+    static Posix createPosixView(UnixPath file, boolean followLinks) {
+        return new Posix(file, followLinks);
+    }
+
+    static Unix createUnixView(UnixPath file, boolean followLinks) {
+        return new Unix(file, followLinks);
+    }
+
+    static FileOwnerAttributeViewImpl createOwnerView(UnixPath file, boolean followLinks) {
+        return new FileOwnerAttributeViewImpl(createPosixView(file, followLinks));
+    }
+}

src/java.base/unix/classes/sun/nio/fs/UnixFileAttributes.java

@@ -0,0 +1,314 @@
+/*
+ * Copyright (c) 2008, 2013, 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;
+
+import java.nio.file.attribute.*;
+import java.util.concurrent.TimeUnit;
+import java.util.Set;
+import java.util.HashSet;
+
+/**
+ * Unix implementation of PosixFileAttributes.
+ */
+
+class UnixFileAttributes
+    implements PosixFileAttributes
+{
+    private int     st_mode;
+    private long    st_ino;
+    private long    st_dev;
+    private long    st_rdev;
+    private int     st_nlink;
+    private int     st_uid;
+    private int     st_gid;
+    private long    st_size;
+    private long    st_atime_sec;
+    private long    st_atime_nsec;
+    private long    st_mtime_sec;
+    private long    st_mtime_nsec;
+    private long    st_ctime_sec;
+    private long    st_ctime_nsec;
+    private long    st_birthtime_sec;
+
+    // created lazily
+    private volatile UserPrincipal owner;
+    private volatile GroupPrincipal group;
+    private volatile UnixFileKey key;
+
+    private UnixFileAttributes() {
+    }
+
+    // get the UnixFileAttributes for a given file
+    static UnixFileAttributes get(UnixPath path, boolean followLinks)
+        throws UnixException
+    {
+        UnixFileAttributes attrs = new UnixFileAttributes();
+        if (followLinks) {
+            UnixNativeDispatcher.stat(path, attrs);
+        } else {
+            UnixNativeDispatcher.lstat(path, attrs);
+        }
+        return attrs;
+    }
+
+    // get the UnixFileAttributes for an open file
+    static UnixFileAttributes get(int fd) throws UnixException {
+        UnixFileAttributes attrs = new UnixFileAttributes();
+        UnixNativeDispatcher.fstat(fd, attrs);
+        return attrs;
+    }
+
+    // get the UnixFileAttributes for a given file, relative to open directory
+    static UnixFileAttributes get(int dfd, UnixPath path, boolean followLinks)
+        throws UnixException
+    {
+        UnixFileAttributes attrs = new UnixFileAttributes();
+        int flag = (followLinks) ? 0 : UnixConstants.AT_SYMLINK_NOFOLLOW;
+        UnixNativeDispatcher.fstatat(dfd, path.asByteArray(), flag, attrs);
+        return attrs;
+    }
+
+    // package-private
+    boolean isSameFile(UnixFileAttributes attrs) {
+        return ((st_ino == attrs.st_ino) && (st_dev == attrs.st_dev));
+    }
+
+    // package-private
+    int mode()  { return st_mode; }
+    long ino()  { return st_ino; }
+    long dev()  { return st_dev; }
+    long rdev() { return st_rdev; }
+    int nlink() { return st_nlink; }
+    int uid()   { return st_uid; }
+    int gid()   { return st_gid; }
+
+    private static FileTime toFileTime(long sec, long nsec) {
+        if (nsec == 0) {
+            return FileTime.from(sec, TimeUnit.SECONDS);
+        } else {
+            // truncate to microseconds to avoid overflow with timestamps
+            // way out into the future. We can re-visit this if FileTime
+            // is updated to define a from(secs,nsecs) method.
+            long micro = sec*1000000L + nsec/1000L;
+            return FileTime.from(micro, TimeUnit.MICROSECONDS);
+        }
+    }
+
+    FileTime ctime() {
+        return toFileTime(st_ctime_sec, st_ctime_nsec);
+    }
+
+    boolean isDevice() {
+        int type = st_mode & UnixConstants.S_IFMT;
+        return (type == UnixConstants.S_IFCHR ||
+                type == UnixConstants.S_IFBLK  ||
+                type == UnixConstants.S_IFIFO);
+    }
+
+    @Override
+    public FileTime lastModifiedTime() {
+        return toFileTime(st_mtime_sec, st_mtime_nsec);
+    }
+
+    @Override
+    public FileTime lastAccessTime() {
+        return toFileTime(st_atime_sec, st_atime_nsec);
+    }
+
+    @Override
+    public FileTime creationTime() {
+        if (UnixNativeDispatcher.birthtimeSupported()) {
+            return FileTime.from(st_birthtime_sec, TimeUnit.SECONDS);
+        } else {
+            // return last modified when birth time not supported
+            return lastModifiedTime();
+        }
+    }
+
+    @Override
+    public boolean isRegularFile() {
+       return ((st_mode & UnixConstants.S_IFMT) == UnixConstants.S_IFREG);
+    }
+
+    @Override
+    public boolean isDirectory() {
+        return ((st_mode & UnixConstants.S_IFMT) == UnixConstants.S_IFDIR);
+    }
+
+    @Override
+    public boolean isSymbolicLink() {
+        return ((st_mode & UnixConstants.S_IFMT) == UnixConstants.S_IFLNK);
+    }
+
+    @Override
+    public boolean isOther() {
+        int type = st_mode & UnixConstants.S_IFMT;
+        return (type != UnixConstants.S_IFREG &&
+                type != UnixConstants.S_IFDIR &&
+                type != UnixConstants.S_IFLNK);
+    }
+
+    @Override
+    public long size() {
+        return st_size;
+    }
+
+    @Override
+    public UnixFileKey fileKey() {
+        if (key == null) {
+            synchronized (this) {
+                if (key == null) {
+                    key = new UnixFileKey(st_dev, st_ino);
+                }
+            }
+        }
+        return key;
+    }
+
+    @Override
+    public UserPrincipal owner() {
+        if (owner == null) {
+            synchronized (this) {
+                if (owner == null) {
+                    owner = UnixUserPrincipals.fromUid(st_uid);
+                }
+            }
+        }
+        return owner;
+    }
+
+    @Override
+    public GroupPrincipal group() {
+        if (group == null) {
+            synchronized (this) {
+                if (group == null) {
+                    group = UnixUserPrincipals.fromGid(st_gid);
+                }
+            }
+        }
+        return group;
+    }
+
+    @Override
+    public Set<PosixFilePermission> permissions() {
+        int bits = (st_mode & UnixConstants.S_IAMB);
+        HashSet<PosixFilePermission> perms = new HashSet<>();
+
+        if ((bits & UnixConstants.S_IRUSR) > 0)
+            perms.add(PosixFilePermission.OWNER_READ);
+        if ((bits & UnixConstants.S_IWUSR) > 0)
+            perms.add(PosixFilePermission.OWNER_WRITE);
+        if ((bits & UnixConstants.S_IXUSR) > 0)
+            perms.add(PosixFilePermission.OWNER_EXECUTE);
+
+        if ((bits & UnixConstants.S_IRGRP) > 0)
+            perms.add(PosixFilePermission.GROUP_READ);
+        if ((bits & UnixConstants.S_IWGRP) > 0)
+            perms.add(PosixFilePermission.GROUP_WRITE);
+        if ((bits & UnixConstants.S_IXGRP) > 0)
+            perms.add(PosixFilePermission.GROUP_EXECUTE);
+
+        if ((bits & UnixConstants.S_IROTH) > 0)
+            perms.add(PosixFilePermission.OTHERS_READ);
+        if ((bits & UnixConstants.S_IWOTH) > 0)
+            perms.add(PosixFilePermission.OTHERS_WRITE);
+        if ((bits & UnixConstants.S_IXOTH) > 0)
+            perms.add(PosixFilePermission.OTHERS_EXECUTE);
+
+        return perms;
+    }
+
+    // wrap this object with BasicFileAttributes object to prevent leaking of
+    // user information
+    BasicFileAttributes asBasicFileAttributes() {
+        return UnixAsBasicFileAttributes.wrap(this);
+    }
+
+    // unwrap BasicFileAttributes to get the underlying UnixFileAttributes
+    // object. Returns null is not wrapped.
+    static UnixFileAttributes toUnixFileAttributes(BasicFileAttributes attrs) {
+        if (attrs instanceof UnixFileAttributes)
+            return (UnixFileAttributes)attrs;
+        if (attrs instanceof UnixAsBasicFileAttributes) {
+            return ((UnixAsBasicFileAttributes)attrs).unwrap();
+        }
+        return null;
+    }
+
+    // wrap a UnixFileAttributes object as a BasicFileAttributes
+    private static class UnixAsBasicFileAttributes implements BasicFileAttributes {
+        private final UnixFileAttributes attrs;
+
+        private UnixAsBasicFileAttributes(UnixFileAttributes attrs) {
+            this.attrs = attrs;
+        }
+
+        static UnixAsBasicFileAttributes wrap(UnixFileAttributes attrs) {
+            return new UnixAsBasicFileAttributes(attrs);
+        }
+
+        UnixFileAttributes unwrap() {
+            return attrs;
+        }
+
+        @Override
+        public FileTime lastModifiedTime() {
+            return attrs.lastModifiedTime();
+        }
+        @Override
+        public FileTime lastAccessTime() {
+            return attrs.lastAccessTime();
+        }
+        @Override
+        public FileTime creationTime() {
+            return attrs.creationTime();
+        }
+        @Override
+        public boolean isRegularFile() {
+            return attrs.isRegularFile();
+        }
+        @Override
+        public boolean isDirectory() {
+            return attrs.isDirectory();
+        }
+        @Override
+        public boolean isSymbolicLink() {
+            return attrs.isSymbolicLink();
+        }
+        @Override
+        public boolean isOther() {
+            return attrs.isOther();
+        }
+        @Override
+        public long size() {
+            return attrs.size();
+        }
+        @Override
+        public Object fileKey() {
+            return attrs.fileKey();
+        }
+    }
+}

src/java.base/unix/classes/sun/nio/fs/UnixFileKey.java

@@ -0,0 +1,67 @@
+/*
+ * Copyright (c) 2008, 2009, 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;
+
+/**
+ * Container for device/inode to uniquely identify file.
+ */
+
+class UnixFileKey {
+    private final long st_dev;
+    private final long st_ino;
+
+    UnixFileKey(long st_dev, long st_ino) {
+        this.st_dev = st_dev;
+        this.st_ino = st_ino;
+    }
+
+    @Override
+    public int hashCode() {
+        return (int)(st_dev ^ (st_dev >>> 32)) +
+               (int)(st_ino ^ (st_ino >>> 32));
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (obj == this)
+            return true;
+        if (!(obj instanceof UnixFileKey))
+            return false;
+        UnixFileKey other = (UnixFileKey)obj;
+        return (this.st_dev == other.st_dev) && (this.st_ino == other.st_ino);
+    }
+
+    @Override
+    public String toString() {
+        StringBuilder sb = new StringBuilder();
+        sb.append("(dev=")
+          .append(Long.toHexString(st_dev))
+          .append(",ino=")
+          .append(st_ino)
+          .append(')');
+        return sb.toString();
+    }
+}

src/java.base/unix/classes/sun/nio/fs/UnixFileModeAttribute.java

@@ -0,0 +1,81 @@
+/*
+ * Copyright (c) 2008, 2009, 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;
+
+import java.nio.file.attribute.*;
+import java.util.*;
+
+class UnixFileModeAttribute {
+    static final int ALL_PERMISSIONS =
+        UnixConstants.S_IRUSR | UnixConstants.S_IWUSR | UnixConstants.S_IXUSR |
+        UnixConstants.S_IRGRP | UnixConstants.S_IWGRP | UnixConstants.S_IXGRP |
+        UnixConstants.S_IROTH | UnixConstants.S_IWOTH | UnixConstants. S_IXOTH;
+
+    static final int ALL_READWRITE =
+        UnixConstants.S_IRUSR | UnixConstants.S_IWUSR |
+        UnixConstants.S_IRGRP | UnixConstants.S_IWGRP |
+        UnixConstants.S_IROTH | UnixConstants.S_IWOTH;
+
+    static final int TEMPFILE_PERMISSIONS =
+        UnixConstants.S_IRUSR | UnixConstants.S_IWUSR | UnixConstants.S_IXUSR;
+
+    private UnixFileModeAttribute() {
+    }
+
+    static int toUnixMode(Set<PosixFilePermission> perms) {
+        int mode = 0;
+        for (PosixFilePermission perm: perms) {
+            if (perm == null)
+                throw new NullPointerException();
+            switch (perm) {
+                case OWNER_READ :     mode |= UnixConstants.S_IRUSR; break;
+                case OWNER_WRITE :    mode |= UnixConstants.S_IWUSR; break;
+                case OWNER_EXECUTE :  mode |= UnixConstants.S_IXUSR; break;
+                case GROUP_READ :     mode |= UnixConstants.S_IRGRP; break;
+                case GROUP_WRITE :    mode |= UnixConstants.S_IWGRP; break;
+                case GROUP_EXECUTE :  mode |= UnixConstants.S_IXGRP; break;
+                case OTHERS_READ :    mode |= UnixConstants.S_IROTH; break;
+                case OTHERS_WRITE :   mode |= UnixConstants.S_IWOTH; break;
+                case OTHERS_EXECUTE : mode |= UnixConstants.S_IXOTH; break;
+            }
+        }
+        return mode;
+    }
+
+    @SuppressWarnings("unchecked")
+    static int toUnixMode(int defaultMode, FileAttribute<?>... attrs) {
+        int mode = defaultMode;
+        for (FileAttribute<?> attr: attrs) {
+            String name = attr.name();
+            if (!name.equals("posix:permissions") && !name.equals("unix:permissions")) {
+                throw new UnsupportedOperationException("'" + attr.name() +
+                   "' not supported as initial attribute");
+            }
+            mode = toUnixMode((Set<PosixFilePermission>)attr.value());
+        }
+        return mode;
+    }
+}

src/java.base/unix/classes/sun/nio/fs/UnixFileStore.java

@@ -0,0 +1,266 @@
+/*
+ * Copyright (c) 2008, 2015, 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;
+
+import java.nio.file.*;
+import java.nio.file.attribute.*;
+import java.nio.channels.*;
+import java.util.*;
+import java.io.IOException;
+import java.security.AccessController;
+import java.security.PrivilegedAction;
+
+/**
+ * Base implementation of FileStore for Unix/like implementations.
+ */
+
+abstract class UnixFileStore
+    extends FileStore
+{
+    // original path of file that identified file system
+    private final UnixPath file;
+
+    // device ID
+    private final long dev;
+
+    // entry in the mount tab
+    private final UnixMountEntry entry;
+
+    // return the device ID where the given file resides
+    private static long devFor(UnixPath file) throws IOException {
+        try {
+            return UnixFileAttributes.get(file, true).dev();
+        } catch (UnixException x) {
+            x.rethrowAsIOException(file);
+            return 0L;  // keep compiler happy
+        }
+    }
+
+    UnixFileStore(UnixPath file) throws IOException {
+        this.file = file;
+        this.dev = devFor(file);
+        this.entry = findMountEntry();
+    }
+
+    UnixFileStore(UnixFileSystem fs, UnixMountEntry entry) throws IOException {
+        this.file = new UnixPath(fs, entry.dir());
+        this.dev = (entry.dev() == 0L) ? devFor(this.file) : entry.dev();
+        this.entry = entry;
+    }
+
+    /**
+     * Find the mount entry for the file store
+     */
+    abstract UnixMountEntry findMountEntry() throws IOException;
+
+    UnixPath file() {
+        return file;
+    }
+
+    long dev() {
+        return dev;
+    }
+
+    UnixMountEntry entry() {
+        return entry;
+    }
+
+    @Override
+    public String name() {
+        return entry.name();
+    }
+
+    @Override
+    public String type() {
+        return entry.fstype();
+    }
+
+    @Override
+    public boolean isReadOnly() {
+        return entry.isReadOnly();
+    }
+
+    // uses statvfs to read the file system information
+    private UnixFileStoreAttributes readAttributes() throws IOException {
+        try {
+            return UnixFileStoreAttributes.get(file);
+        } catch (UnixException x) {
+            x.rethrowAsIOException(file);
+            return null;    // keep compile happy
+        }
+    }
+
+    @Override
+    public long getTotalSpace() throws IOException {
+        UnixFileStoreAttributes attrs = readAttributes();
+        return attrs.blockSize() * attrs.totalBlocks();
+    }
+
+    @Override
+    public long getUsableSpace() throws IOException {
+       UnixFileStoreAttributes attrs = readAttributes();
+       return attrs.blockSize() * attrs.availableBlocks();
+    }
+
+    @Override
+    public long getUnallocatedSpace() throws IOException {
+        UnixFileStoreAttributes attrs = readAttributes();
+        return attrs.blockSize() * attrs.freeBlocks();
+    }
+
+    @Override
+    public <V extends FileStoreAttributeView> V getFileStoreAttributeView(Class<V> view)
+    {
+        if (view == null)
+            throw new NullPointerException();
+        return (V) null;
+    }
+
+    @Override
+    public Object getAttribute(String attribute) throws IOException {
+        if (attribute.equals("totalSpace"))
+            return getTotalSpace();
+        if (attribute.equals("usableSpace"))
+            return getUsableSpace();
+        if (attribute.equals("unallocatedSpace"))
+            return getUnallocatedSpace();
+        throw new UnsupportedOperationException("'" + attribute + "' not recognized");
+    }
+
+    @Override
+    public boolean supportsFileAttributeView(Class<? extends FileAttributeView> type) {
+        if (type == null)
+            throw new NullPointerException();
+        if (type == BasicFileAttributeView.class)
+            return true;
+        if (type == PosixFileAttributeView.class ||
+            type == FileOwnerAttributeView.class)
+        {
+            // lookup fstypes.properties
+            FeatureStatus status = checkIfFeaturePresent("posix");
+            // assume supported if UNKNOWN
+            return (status != FeatureStatus.NOT_PRESENT);
+        }
+        return false;
+    }
+
+    @Override
+    public boolean supportsFileAttributeView(String name) {
+        if (name.equals("basic") || name.equals("unix"))
+            return true;
+        if (name.equals("posix"))
+            return supportsFileAttributeView(PosixFileAttributeView.class);
+        if (name.equals("owner"))
+            return supportsFileAttributeView(FileOwnerAttributeView.class);
+        return false;
+    }
+
+    @Override
+    public boolean equals(Object ob) {
+        if (ob == this)
+            return true;
+        if (!(ob instanceof UnixFileStore))
+            return false;
+        UnixFileStore other = (UnixFileStore)ob;
+        return (this.dev == other.dev) &&
+               Arrays.equals(this.entry.dir(), other.entry.dir()) &&
+               this.entry.name().equals(other.entry.name());
+    }
+
+    @Override
+    public int hashCode() {
+        return (int)(dev ^ (dev >>> 32)) ^ Arrays.hashCode(entry.dir());
+    }
+
+    @Override
+    public String toString() {
+        StringBuilder sb = new StringBuilder(Util.toString(entry.dir()));
+        sb.append(" (");
+        sb.append(entry.name());
+        sb.append(")");
+        return sb.toString();
+    }
+
+    // -- fstypes.properties --
+
+    private static final Object loadLock = new Object();
+    private static volatile Properties props;
+
+    enum FeatureStatus {
+        PRESENT,
+        NOT_PRESENT,
+        UNKNOWN;
+    }
+
+    /**
+     * Returns status to indicate if file system supports a given feature
+     */
+    FeatureStatus checkIfFeaturePresent(String feature) {
+        if (props == null) {
+            synchronized (loadLock) {
+                if (props == null) {
+                    props = AccessController.doPrivileged(
+                        new PrivilegedAction<>() {
+                            @Override
+                            public Properties run() {
+                                return loadProperties();
+                            }});
+                }
+            }
+        }
+
+        String value = props.getProperty(type());
+        if (value != null) {
+            String[] values = value.split("\\s");
+            for (String s: values) {
+                s = s.trim().toLowerCase();
+                if (s.equals(feature)) {
+                    return FeatureStatus.PRESENT;
+                }
+                if (s.startsWith("no")) {
+                    s = s.substring(2);
+                    if (s.equals(feature)) {
+                        return FeatureStatus.NOT_PRESENT;
+                    }
+                }
+            }
+        }
+        return FeatureStatus.UNKNOWN;
+    }
+
+    private static Properties loadProperties() {
+        Properties result = new Properties();
+        String fstypes = System.getProperty("java.home") + "/lib/fstypes.properties";
+        Path file = Paths.get(fstypes);
+        try {
+            try (ReadableByteChannel rbc = Files.newByteChannel(file)) {
+                result.load(Channels.newReader(rbc, "UTF-8"));
+            }
+        } catch (IOException x) {
+        }
+        return result;
+    }
+}

src/java.base/unix/classes/sun/nio/fs/UnixFileStoreAttributes.java

@@ -0,0 +1,59 @@
+/*
+ * Copyright (c) 2008, 2009, 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 UnixFileStoreAttributes {
+    private long f_frsize;          // block size
+    private long f_blocks;          // total
+    private long f_bfree;           // free
+    private long f_bavail;          // usable
+
+    private UnixFileStoreAttributes() {
+    }
+
+    static UnixFileStoreAttributes get(UnixPath path) throws UnixException {
+        UnixFileStoreAttributes attrs = new UnixFileStoreAttributes();
+        UnixNativeDispatcher.statvfs(path, attrs);
+        return attrs;
+    }
+
+    long blockSize() {
+        return f_frsize;
+    }
+
+    long totalBlocks() {
+        return f_blocks;
+    }
+
+    long freeBlocks() {
+        return f_bfree;
+    }
+
+    long availableBlocks() {
+        return f_bavail;
+    }
+
+}

src/java.base/unix/classes/sun/nio/fs/UnixFileSystem.java

@@ -0,0 +1,360 @@
+/*
+ * Copyright (c) 2008, 2015, 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;
+
+import java.nio.file.*;
+import java.nio.file.attribute.*;
+import java.nio.file.spi.*;
+import java.io.IOException;
+import java.util.*;
+import java.util.regex.Pattern;
+import sun.security.action.GetPropertyAction;
+
+/**
+ * Base implementation of FileSystem for Unix-like implementations.
+ */
+
+abstract class UnixFileSystem
+    extends FileSystem
+{
+    private final UnixFileSystemProvider provider;
+    private final byte[] defaultDirectory;
+    private final boolean needToResolveAgainstDefaultDirectory;
+    private final UnixPath rootDirectory;
+
+    // package-private
+    UnixFileSystem(UnixFileSystemProvider provider, String dir) {
+        this.provider = provider;
+        this.defaultDirectory = Util.toBytes(UnixPath.normalizeAndCheck(dir));
+        if (this.defaultDirectory[0] != '/') {
+            throw new RuntimeException("default directory must be absolute");
+        }
+
+        // if process-wide chdir is allowed or default directory is not the
+        // process working directory then paths must be resolved against the
+        // default directory.
+        String propValue = GetPropertyAction
+                .privilegedGetProperty("sun.nio.fs.chdirAllowed", "false");
+        boolean chdirAllowed = (propValue.length() == 0) ?
+            true : Boolean.valueOf(propValue);
+        if (chdirAllowed) {
+            this.needToResolveAgainstDefaultDirectory = true;
+        } else {
+            byte[] cwd = UnixNativeDispatcher.getcwd();
+            boolean defaultIsCwd = (cwd.length == defaultDirectory.length);
+            if (defaultIsCwd) {
+                for (int i=0; i<cwd.length; i++) {
+                    if (cwd[i] != defaultDirectory[i]) {
+                        defaultIsCwd = false;
+                        break;
+                    }
+                }
+            }
+            this.needToResolveAgainstDefaultDirectory = !defaultIsCwd;
+        }
+
+        // the root directory
+        this.rootDirectory = new UnixPath(this, "/");
+    }
+
+    // package-private
+    byte[] defaultDirectory() {
+        return defaultDirectory;
+    }
+
+    boolean needToResolveAgainstDefaultDirectory() {
+        return needToResolveAgainstDefaultDirectory;
+    }
+
+    UnixPath rootDirectory() {
+        return rootDirectory;
+    }
+
+    boolean isSolaris() {
+        return false;
+    }
+
+    static List<String> standardFileAttributeViews() {
+        return Arrays.asList("basic", "posix", "unix", "owner");
+    }
+
+    @Override
+    public final FileSystemProvider provider() {
+        return provider;
+    }
+
+    @Override
+    public final String getSeparator() {
+        return "/";
+    }
+
+    @Override
+    public final boolean isOpen() {
+        return true;
+    }
+
+    @Override
+    public final boolean isReadOnly() {
+        return false;
+    }
+
+    @Override
+    public final void close() throws IOException {
+        throw new UnsupportedOperationException();
+    }
+
+    /**
+     * Copies non-POSIX attributes from the source to target file.
+     *
+     * Copying a file preserving attributes, or moving a file, will preserve
+     * the file owner/group/permissions/timestamps but it does not preserve
+     * other non-POSIX attributes. This method is invoked by the
+     * copy or move operation to preserve these attributes. It should copy
+     * extended attributes, ACLs, or other attributes.
+     *
+     * @param   sfd
+     *          Open file descriptor to source file
+     * @param   tfd
+     *          Open file descriptor to target file
+     */
+    void copyNonPosixAttributes(int sfd, int tfd) {
+        // no-op by default
+    }
+
+    /**
+     * Unix systems only have a single root directory (/)
+     */
+    @Override
+    public final Iterable<Path> getRootDirectories() {
+        final List<Path> allowedList =
+           Collections.unmodifiableList(Arrays.asList((Path)rootDirectory));
+        return new Iterable<>() {
+            public Iterator<Path> iterator() {
+                try {
+                    SecurityManager sm = System.getSecurityManager();
+                    if (sm != null)
+                        sm.checkRead(rootDirectory.toString());
+                    return allowedList.iterator();
+                } catch (SecurityException x) {
+                    List<Path> disallowed = Collections.emptyList();
+                    return disallowed.iterator();
+                }
+            }
+        };
+    }
+
+    /**
+     * Returns object to iterate over entries in mounttab or equivalent
+     */
+    abstract Iterable<UnixMountEntry> getMountEntries();
+
+    /**
+     * Returns a FileStore to represent the file system for the given mount
+     * mount.
+     */
+    abstract FileStore getFileStore(UnixMountEntry entry) throws IOException;
+
+    /**
+     * Iterator returned by getFileStores method.
+     */
+    private class FileStoreIterator implements Iterator<FileStore> {
+        private final Iterator<UnixMountEntry> entries;
+        private FileStore next;
+
+        FileStoreIterator() {
+            this.entries = getMountEntries().iterator();
+        }
+
+        private FileStore readNext() {
+            assert Thread.holdsLock(this);
+            for (;;) {
+                if (!entries.hasNext())
+                    return null;
+                UnixMountEntry entry = entries.next();
+
+                // skip entries with the "ignore" option
+                if (entry.isIgnored())
+                    continue;
+
+                // check permission to read mount point
+                SecurityManager sm = System.getSecurityManager();
+                if (sm != null) {
+                    try {
+                        sm.checkRead(Util.toString(entry.dir()));
+                    } catch (SecurityException x) {
+                        continue;
+                    }
+                }
+                try {
+                    return getFileStore(entry);
+                } catch (IOException ignore) {
+                    // ignore as per spec
+                }
+            }
+        }
+
+        @Override
+        public synchronized boolean hasNext() {
+            if (next != null)
+                return true;
+            next = readNext();
+            return next != null;
+        }
+
+        @Override
+        public synchronized FileStore next() {
+            if (next == null)
+                next = readNext();
+            if (next == null) {
+                throw new NoSuchElementException();
+            } else {
+                FileStore result = next;
+                next = null;
+                return result;
+            }
+        }
+
+        @Override
+        public void remove() {
+            throw new UnsupportedOperationException();
+        }
+    }
+
+    @Override
+    public final Iterable<FileStore> getFileStores() {
+        SecurityManager sm = System.getSecurityManager();
+        if (sm != null) {
+            try {
+                sm.checkPermission(new RuntimePermission("getFileStoreAttributes"));
+            } catch (SecurityException se) {
+                return Collections.emptyList();
+            }
+        }
+        return new Iterable<>() {
+            public Iterator<FileStore> iterator() {
+                return new FileStoreIterator();
+            }
+        };
+    }
+
+    @Override
+    public final Path getPath(String first, String... more) {
+        String path;
+        if (more.length == 0) {
+            path = first;
+        } else {
+            StringBuilder sb = new StringBuilder();
+            sb.append(first);
+            for (String segment: more) {
+                if (segment.length() > 0) {
+                    if (sb.length() > 0)
+                        sb.append('/');
+                    sb.append(segment);
+                }
+            }
+            path = sb.toString();
+        }
+        return new UnixPath(this, path);
+    }
+
+    @Override
+    public PathMatcher getPathMatcher(String syntaxAndInput) {
+        int pos = syntaxAndInput.indexOf(':');
+        if (pos <= 0 || pos == syntaxAndInput.length())
+            throw new IllegalArgumentException();
+        String syntax = syntaxAndInput.substring(0, pos);
+        String input = syntaxAndInput.substring(pos+1);
+
+        String expr;
+        if (syntax.equalsIgnoreCase(GLOB_SYNTAX)) {
+            expr = Globs.toUnixRegexPattern(input);
+        } else {
+            if (syntax.equalsIgnoreCase(REGEX_SYNTAX)) {
+                expr = input;
+            } else {
+                throw new UnsupportedOperationException("Syntax '" + syntax +
+                    "' not recognized");
+            }
+        }
+
+        // return matcher
+        final Pattern pattern = compilePathMatchPattern(expr);
+
+        return new PathMatcher() {
+            @Override
+            public boolean matches(Path path) {
+                return pattern.matcher(path.toString()).matches();
+            }
+        };
+    }
+
+    private static final String GLOB_SYNTAX = "glob";
+    private static final String REGEX_SYNTAX = "regex";
+
+    @Override
+    public final UserPrincipalLookupService getUserPrincipalLookupService() {
+        return LookupService.instance;
+    }
+
+    private static class LookupService {
+        static final UserPrincipalLookupService instance =
+            new UserPrincipalLookupService() {
+                @Override
+                public UserPrincipal lookupPrincipalByName(String name)
+                    throws IOException
+                {
+                    return UnixUserPrincipals.lookupUser(name);
+                }
+
+                @Override
+                public GroupPrincipal lookupPrincipalByGroupName(String group)
+                    throws IOException
+                {
+                    return UnixUserPrincipals.lookupGroup(group);
+                }
+            };
+    }
+
+    // Override if the platform has different path match requirement, such as
+    // case insensitive or Unicode canonical equal on MacOSX
+    Pattern compilePathMatchPattern(String expr) {
+        return Pattern.compile(expr);
+    }
+
+    // Override if the platform uses different Unicode normalization form
+    // for native file path. For example on MacOSX, the native path is stored
+    // in Unicode NFD form.
+    char[] normalizeNativePath(char[] path) {
+        return path;
+    }
+
+    // Override if the native file path use non-NFC form. For example on MacOSX,
+    // the native path is stored in Unicode NFD form, the path need to be
+    // normalized back to NFC before passed back to Java level.
+    String normalizeJavaPath(String path) {
+        return path;
+    }
+}

src/java.base/unix/classes/sun/nio/fs/UnixFileSystemProvider.java

@@ -0,0 +1,557 @@
+/*
+ * Copyright (c) 2008, 2013, 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;
+
+import java.nio.file.*;
+import java.nio.file.attribute.*;
+import java.nio.file.spi.FileTypeDetector;
+import java.nio.channels.*;
+import java.net.URI;
+import java.util.concurrent.ExecutorService;
+import java.io.IOException;
+import java.io.FilePermission;
+import java.util.*;
+import java.security.AccessController;
+
+import sun.nio.ch.ThreadPool;
+import sun.security.util.SecurityConstants;
+import static sun.nio.fs.UnixNativeDispatcher.*;
+import static sun.nio.fs.UnixConstants.*;
+
+/**
+ * Base implementation of FileSystemProvider
+ */
+
+public abstract class UnixFileSystemProvider
+    extends AbstractFileSystemProvider
+{
+    private static final String USER_DIR = "user.dir";
+    private final UnixFileSystem theFileSystem;
+
+    public UnixFileSystemProvider() {
+        String userDir = System.getProperty(USER_DIR);
+        theFileSystem = newFileSystem(userDir);
+    }
+
+    /**
+     * Constructs a new file system using the given default directory.
+     */
+    abstract UnixFileSystem newFileSystem(String dir);
+
+    @Override
+    public final String getScheme() {
+        return "file";
+    }
+
+    private void checkUri(URI uri) {
+        if (!uri.getScheme().equalsIgnoreCase(getScheme()))
+            throw new IllegalArgumentException("URI does not match this provider");
+        if (uri.getRawAuthority() != null)
+            throw new IllegalArgumentException("Authority component present");
+        String path = uri.getPath();
+        if (path == null)
+            throw new IllegalArgumentException("Path component is undefined");
+        if (!path.equals("/"))
+            throw new IllegalArgumentException("Path component should be '/'");
+        if (uri.getRawQuery() != null)
+            throw new IllegalArgumentException("Query component present");
+        if (uri.getRawFragment() != null)
+            throw new IllegalArgumentException("Fragment component present");
+    }
+
+    @Override
+    public final FileSystem newFileSystem(URI uri, Map<String,?> env) {
+        checkUri(uri);
+        throw new FileSystemAlreadyExistsException();
+    }
+
+    @Override
+    public final FileSystem getFileSystem(URI uri) {
+        checkUri(uri);
+        return theFileSystem;
+    }
+
+    @Override
+    public Path getPath(URI uri) {
+        return UnixUriUtils.fromUri(theFileSystem, uri);
+    }
+
+    UnixPath checkPath(Path obj) {
+        if (obj == null)
+            throw new NullPointerException();
+        if (!(obj instanceof UnixPath))
+            throw new ProviderMismatchException();
+        return (UnixPath)obj;
+    }
+
+    @Override
+    @SuppressWarnings("unchecked")
+    public <V extends FileAttributeView> V getFileAttributeView(Path obj,
+                                                                Class<V> type,
+                                                                LinkOption... options)
+    {
+        UnixPath file = UnixPath.toUnixPath(obj);
+        boolean followLinks = Util.followLinks(options);
+        if (type == BasicFileAttributeView.class)
+            return (V) UnixFileAttributeViews.createBasicView(file, followLinks);
+        if (type == PosixFileAttributeView.class)
+            return (V) UnixFileAttributeViews.createPosixView(file, followLinks);
+        if (type == FileOwnerAttributeView.class)
+            return (V) UnixFileAttributeViews.createOwnerView(file, followLinks);
+        if (type == null)
+            throw new NullPointerException();
+        return (V) null;
+    }
+
+    @Override
+    @SuppressWarnings("unchecked")
+    public <A extends BasicFileAttributes> A readAttributes(Path file,
+                                                               Class<A> type,
+                                                               LinkOption... options)
+        throws IOException
+    {
+        Class<? extends BasicFileAttributeView> view;
+        if (type == BasicFileAttributes.class)
+            view = BasicFileAttributeView.class;
+        else if (type == PosixFileAttributes.class)
+            view = PosixFileAttributeView.class;
+        else if (type == null)
+            throw new NullPointerException();
+        else
+            throw new UnsupportedOperationException();
+        return (A) getFileAttributeView(file, view, options).readAttributes();
+    }
+
+    @Override
+    protected DynamicFileAttributeView getFileAttributeView(Path obj,
+                                                            String name,
+                                                            LinkOption... options)
+    {
+        UnixPath file = UnixPath.toUnixPath(obj);
+        boolean followLinks = Util.followLinks(options);
+        if (name.equals("basic"))
+            return UnixFileAttributeViews.createBasicView(file, followLinks);
+        if (name.equals("posix"))
+            return UnixFileAttributeViews.createPosixView(file, followLinks);
+        if (name.equals("unix"))
+            return UnixFileAttributeViews.createUnixView(file, followLinks);
+        if (name.equals("owner"))
+            return UnixFileAttributeViews.createOwnerView(file, followLinks);
+        return null;
+    }
+
+    @Override
+    public FileChannel newFileChannel(Path obj,
+                                      Set<? extends OpenOption> options,
+                                      FileAttribute<?>... attrs)
+        throws IOException
+    {
+        UnixPath file = checkPath(obj);
+        int mode = UnixFileModeAttribute
+            .toUnixMode(UnixFileModeAttribute.ALL_READWRITE, attrs);
+        try {
+            return UnixChannelFactory.newFileChannel(file, options, mode);
+        } catch (UnixException x) {
+            x.rethrowAsIOException(file);
+            return null;
+        }
+    }
+
+    @Override
+    public AsynchronousFileChannel newAsynchronousFileChannel(Path obj,
+                                                              Set<? extends OpenOption> options,
+                                                              ExecutorService executor,
+                                                              FileAttribute<?>... attrs) throws IOException
+    {
+        UnixPath file = checkPath(obj);
+        int mode = UnixFileModeAttribute
+            .toUnixMode(UnixFileModeAttribute.ALL_READWRITE, attrs);
+        ThreadPool pool = (executor == null) ? null : ThreadPool.wrap(executor, 0);
+        try {
+            return UnixChannelFactory
+                .newAsynchronousFileChannel(file, options, mode, pool);
+        } catch (UnixException x) {
+            x.rethrowAsIOException(file);
+            return null;
+        }
+    }
+
+
+    @Override
+    public SeekableByteChannel newByteChannel(Path obj,
+                                              Set<? extends OpenOption> options,
+                                              FileAttribute<?>... attrs)
+         throws IOException
+    {
+        UnixPath file = UnixPath.toUnixPath(obj);
+        int mode = UnixFileModeAttribute
+            .toUnixMode(UnixFileModeAttribute.ALL_READWRITE, attrs);
+        try {
+            return UnixChannelFactory.newFileChannel(file, options, mode);
+        } catch (UnixException x) {
+            x.rethrowAsIOException(file);
+            return null;  // keep compiler happy
+        }
+    }
+
+    @Override
+    boolean implDelete(Path obj, boolean failIfNotExists) throws IOException {
+        UnixPath file = UnixPath.toUnixPath(obj);
+        file.checkDelete();
+
+        // need file attributes to know if file is directory
+        UnixFileAttributes attrs = null;
+        try {
+            attrs = UnixFileAttributes.get(file, false);
+            if (attrs.isDirectory()) {
+                rmdir(file);
+            } else {
+                unlink(file);
+            }
+            return true;
+        } catch (UnixException x) {
+            // no-op if file does not exist
+            if (!failIfNotExists && x.errno() == ENOENT)
+                return false;
+
+            // DirectoryNotEmptyException if not empty
+            if (attrs != null && attrs.isDirectory() &&
+                (x.errno() == EEXIST || x.errno() == ENOTEMPTY))
+                throw new DirectoryNotEmptyException(file.getPathForExceptionMessage());
+
+            x.rethrowAsIOException(file);
+            return false;
+        }
+    }
+
+    @Override
+    public void copy(Path source, Path target, CopyOption... options)
+        throws IOException
+    {
+        UnixCopyFile.copy(UnixPath.toUnixPath(source),
+                          UnixPath.toUnixPath(target),
+                          options);
+    }
+
+    @Override
+    public void move(Path source, Path target, CopyOption... options)
+        throws IOException
+    {
+        UnixCopyFile.move(UnixPath.toUnixPath(source),
+                          UnixPath.toUnixPath(target),
+                          options);
+    }
+
+    @Override
+    public void checkAccess(Path obj, AccessMode... modes) throws IOException {
+        UnixPath file = UnixPath.toUnixPath(obj);
+        boolean e = false;
+        boolean r = false;
+        boolean w = false;
+        boolean x = false;
+
+        if (modes.length == 0) {
+            e = true;
+        } else {
+            for (AccessMode mode: modes) {
+                switch (mode) {
+                    case READ : r = true; break;
+                    case WRITE : w = true; break;
+                    case EXECUTE : x = true; break;
+                    default: throw new AssertionError("Should not get here");
+                }
+            }
+        }
+
+        int mode = 0;
+        if (e || r) {
+            file.checkRead();
+            mode |= (r) ? R_OK : F_OK;
+        }
+        if (w) {
+            file.checkWrite();
+            mode |= W_OK;
+        }
+        if (x) {
+            SecurityManager sm = System.getSecurityManager();
+            if (sm != null) {
+                // not cached
+                sm.checkExec(file.getPathForPermissionCheck());
+            }
+            mode |= X_OK;
+        }
+        try {
+            access(file, mode);
+        } catch (UnixException exc) {
+            exc.rethrowAsIOException(file);
+        }
+    }
+
+    @Override
+    public boolean isSameFile(Path obj1, Path obj2) throws IOException {
+        UnixPath file1 = UnixPath.toUnixPath(obj1);
+        if (file1.equals(obj2))
+            return true;
+        if (obj2 == null)
+            throw new NullPointerException();
+        if (!(obj2 instanceof UnixPath))
+            return false;
+        UnixPath file2 = (UnixPath)obj2;
+
+        // check security manager access to both files
+        file1.checkRead();
+        file2.checkRead();
+
+        UnixFileAttributes attrs1;
+        UnixFileAttributes attrs2;
+        try {
+             attrs1 = UnixFileAttributes.get(file1, true);
+        } catch (UnixException x) {
+            x.rethrowAsIOException(file1);
+            return false;    // keep compiler happy
+        }
+        try {
+            attrs2 = UnixFileAttributes.get(file2, true);
+        } catch (UnixException x) {
+            x.rethrowAsIOException(file2);
+            return false;    // keep compiler happy
+        }
+        return attrs1.isSameFile(attrs2);
+    }
+
+    @Override
+    public boolean isHidden(Path obj) {
+        UnixPath file = UnixPath.toUnixPath(obj);
+        file.checkRead();
+        UnixPath name = file.getFileName();
+        if (name == null)
+            return false;
+        return (name.asByteArray()[0] == '.');
+    }
+
+    /**
+     * Returns a FileStore to represent the file system where the given file
+     * reside.
+     */
+    abstract FileStore getFileStore(UnixPath path) throws IOException;
+
+    @Override
+    public FileStore getFileStore(Path obj) throws IOException {
+        UnixPath file = UnixPath.toUnixPath(obj);
+        SecurityManager sm = System.getSecurityManager();
+        if (sm != null) {
+            sm.checkPermission(new RuntimePermission("getFileStoreAttributes"));
+            file.checkRead();
+        }
+        return getFileStore(file);
+    }
+
+    @Override
+    public void createDirectory(Path obj, FileAttribute<?>... attrs)
+        throws IOException
+    {
+        UnixPath dir = UnixPath.toUnixPath(obj);
+        dir.checkWrite();
+
+        int mode = UnixFileModeAttribute.toUnixMode(UnixFileModeAttribute.ALL_PERMISSIONS, attrs);
+        try {
+            mkdir(dir, mode);
+        } catch (UnixException x) {
+            if (x.errno() == EISDIR)
+                throw new FileAlreadyExistsException(dir.toString());
+            x.rethrowAsIOException(dir);
+        }
+    }
+
+
+    @Override
+    public DirectoryStream<Path> newDirectoryStream(Path obj, DirectoryStream.Filter<? super Path> filter)
+        throws IOException
+    {
+        UnixPath dir = UnixPath.toUnixPath(obj);
+        dir.checkRead();
+        if (filter == null)
+            throw new NullPointerException();
+
+        // can't return SecureDirectoryStream on kernels that don't support openat
+        // or O_NOFOLLOW
+        if (!openatSupported() || O_NOFOLLOW == 0) {
+            try {
+                long ptr = opendir(dir);
+                return new UnixDirectoryStream(dir, ptr, filter);
+            } catch (UnixException x) {
+                if (x.errno() == ENOTDIR)
+                    throw new NotDirectoryException(dir.getPathForExceptionMessage());
+                x.rethrowAsIOException(dir);
+            }
+        }
+
+        // open directory and dup file descriptor for use by
+        // opendir/readdir/closedir
+        int dfd1 = -1;
+        int dfd2 = -1;
+        long dp = 0L;
+        try {
+            dfd1 = open(dir, O_RDONLY, 0);
+            dfd2 = dup(dfd1);
+            dp = fdopendir(dfd1);
+        } catch (UnixException x) {
+            if (dfd1 != -1)
+                UnixNativeDispatcher.close(dfd1);
+            if (dfd2 != -1)
+                UnixNativeDispatcher.close(dfd2);
+            if (x.errno() == UnixConstants.ENOTDIR)
+                throw new NotDirectoryException(dir.getPathForExceptionMessage());
+            x.rethrowAsIOException(dir);
+        }
+        return new UnixSecureDirectoryStream(dir, dp, dfd2, filter);
+    }
+
+    @Override
+    public void createSymbolicLink(Path obj1, Path obj2, FileAttribute<?>... attrs)
+        throws IOException
+    {
+        UnixPath link = UnixPath.toUnixPath(obj1);
+        UnixPath target = UnixPath.toUnixPath(obj2);
+
+        // no attributes supported when creating links
+        if (attrs.length > 0) {
+            UnixFileModeAttribute.toUnixMode(0, attrs);  // may throw NPE or UOE
+            throw new UnsupportedOperationException("Initial file attributes" +
+                "not supported when creating symbolic link");
+        }
+
+        // permission check
+        SecurityManager sm = System.getSecurityManager();
+        if (sm != null) {
+            sm.checkPermission(new LinkPermission("symbolic"));
+            link.checkWrite();
+        }
+
+        // create link
+        try {
+            symlink(target.asByteArray(), link);
+        } catch (UnixException x) {
+            x.rethrowAsIOException(link);
+        }
+    }
+
+    @Override
+    public void createLink(Path obj1, Path obj2) throws IOException {
+        UnixPath link = UnixPath.toUnixPath(obj1);
+        UnixPath existing = UnixPath.toUnixPath(obj2);
+
+        // permission check
+        SecurityManager sm = System.getSecurityManager();
+        if (sm != null) {
+            sm.checkPermission(new LinkPermission("hard"));
+            link.checkWrite();
+            existing.checkWrite();
+        }
+        try {
+            link(existing, link);
+        } catch (UnixException x) {
+            x.rethrowAsIOException(link, existing);
+        }
+    }
+
+    @Override
+    public Path readSymbolicLink(Path obj1) throws IOException {
+        UnixPath link = UnixPath.toUnixPath(obj1);
+        // permission check
+        SecurityManager sm = System.getSecurityManager();
+        if (sm != null) {
+            FilePermission perm = new FilePermission(link.getPathForPermissionCheck(),
+                SecurityConstants.FILE_READLINK_ACTION);
+            sm.checkPermission(perm);
+        }
+        try {
+            byte[] target = readlink(link);
+            return new UnixPath(link.getFileSystem(), target);
+        } catch (UnixException x) {
+           if (x.errno() == UnixConstants.EINVAL)
+                throw new NotLinkException(link.getPathForExceptionMessage());
+            x.rethrowAsIOException(link);
+            return null;    // keep compiler happy
+        }
+    }
+
+    @Override
+    public final boolean isDirectory(Path obj) {
+        UnixPath file = UnixPath.toUnixPath(obj);
+        file.checkRead();
+        int mode = UnixNativeDispatcher.stat(file);
+        return ((mode & UnixConstants.S_IFMT) == UnixConstants.S_IFDIR);
+    }
+
+    @Override
+    public final boolean isRegularFile(Path obj) {
+        UnixPath file = UnixPath.toUnixPath(obj);
+        file.checkRead();
+        int mode = UnixNativeDispatcher.stat(file);
+        return ((mode & UnixConstants.S_IFMT) == UnixConstants.S_IFREG);
+    }
+
+    @Override
+    public final boolean exists(Path obj) {
+        UnixPath file = UnixPath.toUnixPath(obj);
+        file.checkRead();
+        return UnixNativeDispatcher.exists(file);
+    }
+
+    /**
+     * Returns a {@code FileTypeDetector} for this platform.
+     */
+    FileTypeDetector getFileTypeDetector() {
+        return new AbstractFileTypeDetector() {
+            @Override
+            public String implProbeContentType(Path file) {
+                return null;
+            }
+        };
+    }
+
+    /**
+     * Returns a {@code FileTypeDetector} that chains the given array of file
+     * type detectors. When the {@code implProbeContentType} method is invoked
+     * then each of the detectors is invoked in turn, the result from the
+     * first to detect the file type is returned.
+     */
+    final FileTypeDetector chain(final AbstractFileTypeDetector... detectors) {
+        return new AbstractFileTypeDetector() {
+            @Override
+            protected String implProbeContentType(Path file) throws IOException {
+                for (AbstractFileTypeDetector detector : detectors) {
+                    String result = detector.implProbeContentType(file);
+                    if (result != null && !result.isEmpty()) {
+                        return result;
+                    }
+                }
+                return null;
+            }
+        };
+    }
+}

src/java.base/unix/classes/sun/nio/fs/UnixMountEntry.java

@@ -0,0 +1,85 @@
+/*
+ * Copyright (c) 2008, 2013, 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;
+
+/**
+ * Represents an entry in the mount table.
+ */
+
+class UnixMountEntry {
+    private byte[] name;        // file system name
+    private byte[] dir;         // directory (mount point)
+    private byte[] fstype;      // ufs, nfs, ...
+    private byte[] opts;        // mount options
+    private long dev;           // device ID
+
+    private volatile String fstypeAsString;
+    private volatile String optionsAsString;
+
+    UnixMountEntry() {
+    }
+
+    String name() {
+        return Util.toString(name);
+    }
+
+    String fstype() {
+        if (fstypeAsString == null)
+            fstypeAsString = Util.toString(fstype);
+        return fstypeAsString;
+    }
+
+    byte[] dir() {
+        return dir;
+    }
+
+    long dev() {
+        return dev;
+    }
+
+    /**
+     * Tells whether the mount entry has the given option.
+     */
+    boolean hasOption(String requested) {
+        if (optionsAsString == null)
+            optionsAsString = Util.toString(opts);
+        for (String opt: Util.split(optionsAsString, ',')) {
+            if (opt.equals(requested))
+                return true;
+        }
+        return false;
+    }
+
+    // generic option
+    boolean isIgnored() {
+        return hasOption("ignore");
+    }
+
+    // generic option
+    boolean isReadOnly() {
+        return hasOption("ro");
+    }
+}

src/java.base/unix/classes/sun/nio/fs/UnixNativeDispatcher.java

@@ -0,0 +1,616 @@
+/*
+ * Copyright (c) 2008, 2015, 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;
+
+import java.security.AccessController;
+import java.security.PrivilegedAction;
+
+/**
+ * Unix system and library calls.
+ */
+
+class UnixNativeDispatcher {
+    protected UnixNativeDispatcher() { }
+
+    // returns a NativeBuffer containing the given path
+    private static NativeBuffer copyToNativeBuffer(UnixPath path) {
+        byte[] cstr = path.getByteArrayForSysCalls();
+        int size = cstr.length + 1;
+        NativeBuffer buffer = NativeBuffers.getNativeBufferFromCache(size);
+        if (buffer == null) {
+            buffer = NativeBuffers.allocNativeBuffer(size);
+        } else {
+            // buffer already contains the path
+            if (buffer.owner() == path)
+                return buffer;
+        }
+        NativeBuffers.copyCStringToNativeBuffer(cstr, buffer);
+        buffer.setOwner(path);
+        return buffer;
+    }
+
+    /**
+     * char *getcwd(char *buf, size_t size);
+     */
+    static native byte[] getcwd();
+
+    /**
+     * int dup(int filedes)
+     */
+    static native int dup(int filedes) throws UnixException;
+
+    /**
+     * int open(const char* path, int oflag, mode_t mode)
+     */
+    static int open(UnixPath path, int flags, int mode) throws UnixException {
+        NativeBuffer buffer = copyToNativeBuffer(path);
+        try {
+            return open0(buffer.address(), flags, mode);
+        } finally {
+            buffer.release();
+        }
+    }
+    private static native int open0(long pathAddress, int flags, int mode)
+        throws UnixException;
+
+    /**
+     * int openat(int dfd, const char* path, int oflag, mode_t mode)
+     */
+    static int openat(int dfd, byte[] path, int flags, int mode) throws UnixException {
+        NativeBuffer buffer = NativeBuffers.asNativeBuffer(path);
+        try {
+            return openat0(dfd, buffer.address(), flags, mode);
+        } finally {
+            buffer.release();
+        }
+    }
+    private static native int openat0(int dfd, long pathAddress, int flags, int mode)
+        throws UnixException;
+
+    /**
+     * close(int filedes). If fd is -1 this is a no-op.
+     */
+    static void close(int fd) {
+        if (fd != -1) {
+            close0(fd);
+        }
+    }
+    private static native void close0(int fd);
+
+    /**
+     * FILE* fopen(const char *filename, const char* mode);
+     */
+    static long fopen(UnixPath filename, String mode) throws UnixException {
+        NativeBuffer pathBuffer = copyToNativeBuffer(filename);
+        NativeBuffer modeBuffer = NativeBuffers.asNativeBuffer(Util.toBytes(mode));
+        try {
+            return fopen0(pathBuffer.address(), modeBuffer.address());
+        } finally {
+            modeBuffer.release();
+            pathBuffer.release();
+        }
+    }
+    private static native long fopen0(long pathAddress, long modeAddress)
+        throws UnixException;
+
+    /**
+     * fclose(FILE* stream)
+     */
+    static native void fclose(long stream) throws UnixException;
+
+    /**
+     * link(const char* existing, const char* new)
+     */
+    static void link(UnixPath existing, UnixPath newfile) throws UnixException {
+        NativeBuffer existingBuffer = copyToNativeBuffer(existing);
+        NativeBuffer newBuffer = copyToNativeBuffer(newfile);
+        try {
+            link0(existingBuffer.address(), newBuffer.address());
+        } finally {
+            newBuffer.release();
+            existingBuffer.release();
+        }
+    }
+    private static native void link0(long existingAddress, long newAddress)
+        throws UnixException;
+
+    /**
+     * unlink(const char* path)
+     */
+    static void unlink(UnixPath path) throws UnixException {
+        NativeBuffer buffer = copyToNativeBuffer(path);
+        try {
+            unlink0(buffer.address());
+        } finally {
+            buffer.release();
+        }
+    }
+    private static native void unlink0(long pathAddress) throws UnixException;
+
+    /**
+     * unlinkat(int dfd, const char* path, int flag)
+     */
+    static void unlinkat(int dfd, byte[] path, int flag) throws UnixException {
+        NativeBuffer buffer = NativeBuffers.asNativeBuffer(path);
+        try {
+            unlinkat0(dfd, buffer.address(), flag);
+        } finally {
+            buffer.release();
+        }
+    }
+    private static native void unlinkat0(int dfd, long pathAddress, int flag)
+        throws UnixException;
+
+    /**
+     * mknod(const char* path, mode_t mode, dev_t dev)
+     */
+    static void mknod(UnixPath path, int mode, long dev) throws UnixException {
+        NativeBuffer buffer = copyToNativeBuffer(path);
+        try {
+            mknod0(buffer.address(), mode, dev);
+        } finally {
+            buffer.release();
+        }
+    }
+    private static native void mknod0(long pathAddress, int mode, long dev)
+        throws UnixException;
+
+    /**
+     *  rename(const char* old, const char* new)
+     */
+    static void rename(UnixPath from, UnixPath to) throws UnixException {
+        NativeBuffer fromBuffer = copyToNativeBuffer(from);
+        NativeBuffer toBuffer = copyToNativeBuffer(to);
+        try {
+            rename0(fromBuffer.address(), toBuffer.address());
+        } finally {
+            toBuffer.release();
+            fromBuffer.release();
+        }
+    }
+    private static native void rename0(long fromAddress, long toAddress)
+        throws UnixException;
+
+    /**
+     *  renameat(int fromfd, const char* old, int tofd, const char* new)
+     */
+    static void renameat(int fromfd, byte[] from, int tofd, byte[] to) throws UnixException {
+        NativeBuffer fromBuffer = NativeBuffers.asNativeBuffer(from);
+        NativeBuffer toBuffer = NativeBuffers.asNativeBuffer(to);
+        try {
+            renameat0(fromfd, fromBuffer.address(), tofd, toBuffer.address());
+        } finally {
+            toBuffer.release();
+            fromBuffer.release();
+        }
+    }
+    private static native void renameat0(int fromfd, long fromAddress, int tofd, long toAddress)
+        throws UnixException;
+
+    /**
+     * mkdir(const char* path, mode_t mode)
+     */
+    static void mkdir(UnixPath path, int mode) throws UnixException {
+        NativeBuffer buffer = copyToNativeBuffer(path);
+        try {
+            mkdir0(buffer.address(), mode);
+        } finally {
+            buffer.release();
+        }
+    }
+    private static native void mkdir0(long pathAddress, int mode) throws UnixException;
+
+    /**
+     * rmdir(const char* path)
+     */
+    static void rmdir(UnixPath path) throws UnixException {
+        NativeBuffer buffer = copyToNativeBuffer(path);
+        try {
+            rmdir0(buffer.address());
+        } finally {
+            buffer.release();
+        }
+    }
+    private static native void rmdir0(long pathAddress) throws UnixException;
+
+    /**
+     * readlink(const char* path, char* buf, size_t bufsize)
+     *
+     * @return  link target
+     */
+    static byte[] readlink(UnixPath path) throws UnixException {
+        NativeBuffer buffer = copyToNativeBuffer(path);
+        try {
+            return readlink0(buffer.address());
+        } finally {
+            buffer.release();
+        }
+    }
+    private static native byte[] readlink0(long pathAddress) throws UnixException;
+
+    /**
+     * realpath(const char* path, char* resolved_name)
+     *
+     * @return  resolved path
+     */
+    static byte[] realpath(UnixPath path) throws UnixException {
+        NativeBuffer buffer = copyToNativeBuffer(path);
+        try {
+            return realpath0(buffer.address());
+        } finally {
+            buffer.release();
+        }
+    }
+    private static native byte[] realpath0(long pathAddress) throws UnixException;
+
+    /**
+     * symlink(const char* name1, const char* name2)
+     */
+    static void symlink(byte[] name1, UnixPath name2) throws UnixException {
+        NativeBuffer targetBuffer = NativeBuffers.asNativeBuffer(name1);
+        NativeBuffer linkBuffer = copyToNativeBuffer(name2);
+        try {
+            symlink0(targetBuffer.address(), linkBuffer.address());
+        } finally {
+            linkBuffer.release();
+            targetBuffer.release();
+        }
+    }
+    private static native void symlink0(long name1, long name2)
+        throws UnixException;
+
+    /**
+     * stat(const char* path, struct stat* buf)
+     */
+    static void stat(UnixPath path, UnixFileAttributes attrs) throws UnixException {
+        NativeBuffer buffer = copyToNativeBuffer(path);
+        try {
+            stat0(buffer.address(), attrs);
+        } finally {
+            buffer.release();
+        }
+    }
+    private static native void stat0(long pathAddress, UnixFileAttributes attrs)
+        throws UnixException;
+
+
+    /**
+     * stat(const char* path, struct stat* buf)
+     *
+     * @return st_mode (file type and mode) or 0 if an error occurs.
+     */
+    static int stat(UnixPath path) {
+        NativeBuffer buffer = copyToNativeBuffer(path);
+        try {
+            return stat1(buffer.address());
+        } finally {
+            buffer.release();
+        }
+    }
+    private static native int stat1(long pathAddress);
+
+
+    /**
+     * lstat(const char* path, struct stat* buf)
+     */
+    static void lstat(UnixPath path, UnixFileAttributes attrs) throws UnixException {
+        NativeBuffer buffer = copyToNativeBuffer(path);
+        try {
+            lstat0(buffer.address(), attrs);
+        } finally {
+            buffer.release();
+        }
+    }
+    private static native void lstat0(long pathAddress, UnixFileAttributes attrs)
+        throws UnixException;
+
+    /**
+     * fstat(int filedes, struct stat* buf)
+     */
+    static native void fstat(int fd, UnixFileAttributes attrs) throws UnixException;
+
+    /**
+     * fstatat(int filedes,const char* path,  struct stat* buf, int flag)
+     */
+    static void fstatat(int dfd, byte[] path, int flag, UnixFileAttributes attrs)
+        throws UnixException
+    {
+        NativeBuffer buffer = NativeBuffers.asNativeBuffer(path);
+        try {
+            fstatat0(dfd, buffer.address(), flag, attrs);
+        } finally {
+            buffer.release();
+        }
+    }
+    private static native void fstatat0(int dfd, long pathAddress, int flag,
+        UnixFileAttributes attrs) throws UnixException;
+
+    /**
+     * chown(const char* path, uid_t owner, gid_t group)
+     */
+    static void chown(UnixPath path, int uid, int gid) throws UnixException {
+        NativeBuffer buffer = copyToNativeBuffer(path);
+        try {
+            chown0(buffer.address(), uid, gid);
+        } finally {
+            buffer.release();
+        }
+    }
+    private static native void chown0(long pathAddress, int uid, int gid)
+        throws UnixException;
+
+    /**
+     * lchown(const char* path, uid_t owner, gid_t group)
+     */
+    static void lchown(UnixPath path, int uid, int gid) throws UnixException {
+        NativeBuffer buffer = copyToNativeBuffer(path);
+        try {
+            lchown0(buffer.address(), uid, gid);
+        } finally {
+            buffer.release();
+        }
+    }
+    private static native void lchown0(long pathAddress, int uid, int gid)
+        throws UnixException;
+
+    /**
+     * fchown(int filedes, uid_t owner, gid_t group)
+     */
+    static native void fchown(int fd, int uid, int gid) throws UnixException;
+
+    /**
+     * chmod(const char* path, mode_t mode)
+     */
+    static void chmod(UnixPath path, int mode) throws UnixException {
+        NativeBuffer buffer = copyToNativeBuffer(path);
+        try {
+            chmod0(buffer.address(), mode);
+        } finally {
+            buffer.release();
+        }
+    }
+    private static native void chmod0(long pathAddress, int mode)
+        throws UnixException;
+
+    /**
+     * fchmod(int fildes, mode_t mode)
+     */
+    static native void fchmod(int fd, int mode) throws UnixException;
+
+    /**
+     * utimes(conar char* path, const struct timeval times[2])
+     */
+    static void utimes(UnixPath path, long times0, long times1)
+        throws UnixException
+    {
+        NativeBuffer buffer = copyToNativeBuffer(path);
+        try {
+            utimes0(buffer.address(), times0, times1);
+        } finally {
+            buffer.release();
+        }
+    }
+    private static native void utimes0(long pathAddress, long times0, long times1)
+        throws UnixException;
+
+    /**
+     * futimes(int fildes,, const struct timeval times[2])
+     */
+    static native void futimes(int fd, long times0, long times1) throws UnixException;
+
+    /**
+     * DIR *opendir(const char* dirname)
+     */
+    static long opendir(UnixPath path) throws UnixException {
+        NativeBuffer buffer = copyToNativeBuffer(path);
+        try {
+            return opendir0(buffer.address());
+        } finally {
+            buffer.release();
+        }
+    }
+    private static native long opendir0(long pathAddress) throws UnixException;
+
+    /**
+     * DIR* fdopendir(int filedes)
+     */
+    static native long fdopendir(int dfd) throws UnixException;
+
+
+    /**
+     * closedir(DIR* dirp)
+     */
+    static native void closedir(long dir) throws UnixException;
+
+    /**
+     * struct dirent* readdir(DIR *dirp)
+     *
+     * @return  dirent->d_name
+     */
+    static native byte[] readdir(long dir) throws UnixException;
+
+    /**
+     * size_t read(int fildes, void* buf, size_t nbyte)
+     */
+    static native int read(int fildes, long buf, int nbyte) throws UnixException;
+
+    /**
+     * size_t writeint fildes, void* buf, size_t nbyte)
+     */
+    static native int write(int fildes, long buf, int nbyte) throws UnixException;
+
+    /**
+     * access(const char* path, int amode);
+     */
+    static void access(UnixPath path, int amode) throws UnixException {
+        NativeBuffer buffer = copyToNativeBuffer(path);
+        try {
+            access0(buffer.address(), amode);
+        } finally {
+            buffer.release();
+        }
+    }
+    private static native void access0(long pathAddress, int amode) throws UnixException;
+
+    /**
+     * access(constant char* path, F_OK)
+     *
+     * @return true if the file exists, false otherwise
+     */
+    static boolean exists(UnixPath path) {
+        NativeBuffer buffer = copyToNativeBuffer(path);
+        try {
+            return exists0(buffer.address());
+        } finally {
+            buffer.release();
+        }
+    }
+    private static native boolean exists0(long pathAddress);
+
+
+    /**
+     * struct passwd *getpwuid(uid_t uid);
+     *
+     * @return  passwd->pw_name
+     */
+    static native byte[] getpwuid(int uid) throws UnixException;
+
+    /**
+     * struct group *getgrgid(gid_t gid);
+     *
+     * @return  group->gr_name
+     */
+    static native byte[] getgrgid(int gid) throws UnixException;
+
+    /**
+     * struct passwd *getpwnam(const char *name);
+     *
+     * @return  passwd->pw_uid
+     */
+    static int getpwnam(String name) throws UnixException {
+        NativeBuffer buffer = NativeBuffers.asNativeBuffer(Util.toBytes(name));
+        try {
+            return getpwnam0(buffer.address());
+        } finally {
+            buffer.release();
+        }
+    }
+    private static native int getpwnam0(long nameAddress) throws UnixException;
+
+    /**
+     * struct group *getgrnam(const char *name);
+     *
+     * @return  group->gr_name
+     */
+    static int getgrnam(String name) throws UnixException {
+        NativeBuffer buffer = NativeBuffers.asNativeBuffer(Util.toBytes(name));
+        try {
+            return getgrnam0(buffer.address());
+        } finally {
+            buffer.release();
+        }
+    }
+    private static native int getgrnam0(long nameAddress) throws UnixException;
+
+    /**
+     * statvfs(const char* path, struct statvfs *buf)
+     */
+    static void statvfs(UnixPath path, UnixFileStoreAttributes attrs)
+        throws UnixException
+    {
+        NativeBuffer buffer = copyToNativeBuffer(path);
+        try {
+            statvfs0(buffer.address(), attrs);
+        } finally {
+            buffer.release();
+        }
+    }
+    private static native void statvfs0(long pathAddress, UnixFileStoreAttributes attrs)
+        throws UnixException;
+
+    /**
+     * long int pathconf(const char *path, int name);
+     */
+    static long pathconf(UnixPath path, int name) throws UnixException {
+        NativeBuffer buffer = copyToNativeBuffer(path);
+        try {
+            return pathconf0(buffer.address(), name);
+        } finally {
+            buffer.release();
+        }
+    }
+    private static native long pathconf0(long pathAddress, int name)
+        throws UnixException;
+
+    /**
+     * long fpathconf(int fildes, int name);
+     */
+    static native long fpathconf(int filedes, int name) throws UnixException;
+
+    /**
+     * char* strerror(int errnum)
+     */
+    static native byte[] strerror(int errnum);
+
+    /**
+     * Capabilities
+     */
+    private static final int SUPPORTS_OPENAT        = 1 << 1;    // syscalls
+    private static final int SUPPORTS_FUTIMES       = 1 << 2;
+    private static final int SUPPORTS_BIRTHTIME     = 1 << 16;   // other features
+    private static final int capabilities;
+
+    /**
+     * Supports openat and other *at calls.
+     */
+    static boolean openatSupported() {
+        return (capabilities & SUPPORTS_OPENAT) != 0;
+    }
+
+    /**
+     * Supports futimes or futimesat
+     */
+    static boolean futimesSupported() {
+        return (capabilities & SUPPORTS_FUTIMES) != 0;
+    }
+
+    /**
+     * Supports file birth (creation) time attribute
+     */
+    static boolean birthtimeSupported() {
+        return (capabilities & SUPPORTS_BIRTHTIME) != 0;
+    }
+
+    private static native int init();
+    static {
+        AccessController.doPrivileged(new PrivilegedAction<>() {
+            public Void run() {
+                System.loadLibrary("nio");
+                return null;
+        }});
+        capabilities = init();
+    }
+}

src/java.base/unix/classes/sun/nio/fs/UnixPath.java

@@ -0,0 +1,922 @@
+/*
+ * Copyright (c) 2008, 2015, 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;
+
+import java.nio.*;
+import java.nio.file.*;
+import java.nio.charset.*;
+import java.io.*;
+import java.net.URI;
+import java.util.*;
+import java.lang.ref.SoftReference;
+
+import static sun.nio.fs.UnixNativeDispatcher.*;
+import static sun.nio.fs.UnixConstants.*;
+
+/**
+ * Solaris/Linux implementation of java.nio.file.Path
+ */
+
+class UnixPath implements Path {
+    private static ThreadLocal<SoftReference<CharsetEncoder>> encoder =
+        new ThreadLocal<SoftReference<CharsetEncoder>>();
+
+    // FIXME - eliminate this reference to reduce space
+    private final UnixFileSystem fs;
+
+    // internal representation
+    private final byte[] path;
+
+    // String representation (created lazily)
+    private volatile String stringValue;
+
+    // cached hashcode (created lazily, no need to be volatile)
+    private int hash;
+
+    // array of offsets of elements in path (created lazily)
+    private volatile int[] offsets;
+
+    UnixPath(UnixFileSystem fs, byte[] path) {
+        this.fs = fs;
+        this.path = path;
+    }
+
+    UnixPath(UnixFileSystem fs, String input) {
+        // removes redundant slashes and checks for invalid characters
+        this(fs, encode(fs, normalizeAndCheck(input)));
+    }
+
+    // package-private
+    // removes redundant slashes and check input for invalid characters
+    static String normalizeAndCheck(String input) {
+        int n = input.length();
+        char prevChar = 0;
+        for (int i=0; i < n; i++) {
+            char c = input.charAt(i);
+            if ((c == '/') && (prevChar == '/'))
+                return normalize(input, n, i - 1);
+            checkNotNul(input, c);
+            prevChar = c;
+        }
+        if (prevChar == '/')
+            return normalize(input, n, n - 1);
+        return input;
+    }
+
+    private static void checkNotNul(String input, char c) {
+        if (c == '\u0000')
+            throw new InvalidPathException(input, "Nul character not allowed");
+    }
+
+    private static String normalize(String input, int len, int off) {
+        if (len == 0)
+            return input;
+        int n = len;
+        while ((n > 0) && (input.charAt(n - 1) == '/')) n--;
+        if (n == 0)
+            return "/";
+        StringBuilder sb = new StringBuilder(input.length());
+        if (off > 0)
+            sb.append(input.substring(0, off));
+        char prevChar = 0;
+        for (int i=off; i < n; i++) {
+            char c = input.charAt(i);
+            if ((c == '/') && (prevChar == '/'))
+                continue;
+            checkNotNul(input, c);
+            sb.append(c);
+            prevChar = c;
+        }
+        return sb.toString();
+    }
+
+    // encodes the given path-string into a sequence of bytes
+    private static byte[] encode(UnixFileSystem fs, String input) {
+        SoftReference<CharsetEncoder> ref = encoder.get();
+        CharsetEncoder ce = (ref != null) ? ref.get() : null;
+        if (ce == null) {
+            ce = Util.jnuEncoding().newEncoder()
+                .onMalformedInput(CodingErrorAction.REPORT)
+                .onUnmappableCharacter(CodingErrorAction.REPORT);
+            encoder.set(new SoftReference<>(ce));
+        }
+
+        char[] ca = fs.normalizeNativePath(input.toCharArray());
+
+        // size output buffer for worse-case size
+        byte[] ba = new byte[(int)(ca.length * (double)ce.maxBytesPerChar())];
+
+        // encode
+        ByteBuffer bb = ByteBuffer.wrap(ba);
+        CharBuffer cb = CharBuffer.wrap(ca);
+        ce.reset();
+        CoderResult cr = ce.encode(cb, bb, true);
+        boolean error;
+        if (!cr.isUnderflow()) {
+            error = true;
+        } else {
+            cr = ce.flush(bb);
+            error = !cr.isUnderflow();
+        }
+        if (error) {
+            throw new InvalidPathException(input,
+                "Malformed input or input contains unmappable characters");
+        }
+
+        // trim result to actual length if required
+        int len = bb.position();
+        if (len != ba.length)
+            ba = Arrays.copyOf(ba, len);
+
+        return ba;
+    }
+
+    // package-private
+    byte[] asByteArray() {
+        return path;
+    }
+
+    // use this path when making system/library calls
+    byte[] getByteArrayForSysCalls() {
+        // resolve against default directory if required (chdir allowed or
+        // file system default directory is not working directory)
+        if (getFileSystem().needToResolveAgainstDefaultDirectory()) {
+            return resolve(getFileSystem().defaultDirectory(), path);
+        } else {
+            if (!isEmpty()) {
+                return path;
+            } else {
+                // empty path case will access current directory
+                byte[] here = { '.' };
+                return here;
+            }
+        }
+    }
+
+    // use this message when throwing exceptions
+    String getPathForExceptionMessage() {
+        return toString();
+    }
+
+    // use this path for permission checks
+    String getPathForPermissionCheck() {
+        if (getFileSystem().needToResolveAgainstDefaultDirectory()) {
+            return Util.toString(getByteArrayForSysCalls());
+        } else {
+            return toString();
+        }
+    }
+
+    // Checks that the given file is a UnixPath
+    static UnixPath toUnixPath(Path obj) {
+        if (obj == null)
+            throw new NullPointerException();
+        if (!(obj instanceof UnixPath))
+            throw new ProviderMismatchException();
+        return (UnixPath)obj;
+    }
+
+    // create offset list if not already created
+    private void initOffsets() {
+        if (offsets == null) {
+            int count, index;
+
+            // count names
+            count = 0;
+            index = 0;
+            if (isEmpty()) {
+                // empty path has one name
+                count = 1;
+            } else {
+                while (index < path.length) {
+                    byte c = path[index++];
+                    if (c != '/') {
+                        count++;
+                        while (index < path.length && path[index] != '/')
+                            index++;
+                    }
+                }
+            }
+
+            // populate offsets
+            int[] result = new int[count];
+            count = 0;
+            index = 0;
+            while (index < path.length) {
+                byte c = path[index];
+                if (c == '/') {
+                    index++;
+                } else {
+                    result[count++] = index++;
+                    while (index < path.length && path[index] != '/')
+                        index++;
+                }
+            }
+            synchronized (this) {
+                if (offsets == null)
+                    offsets = result;
+            }
+        }
+    }
+
+    // returns {@code true} if this path is an empty path
+    private boolean isEmpty() {
+        return path.length == 0;
+    }
+
+    // returns an empty path
+    private UnixPath emptyPath() {
+        return new UnixPath(getFileSystem(), new byte[0]);
+    }
+
+
+    // return true if this path has "." or ".."
+    private boolean hasDotOrDotDot() {
+        int n = getNameCount();
+        for (int i=0; i<n; i++) {
+            byte[] bytes = getName(i).path;
+            if ((bytes.length == 1 && bytes[0] == '.'))
+                return true;
+            if ((bytes.length == 2 && bytes[0] == '.') && bytes[1] == '.') {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    @Override
+    public UnixFileSystem getFileSystem() {
+        return fs;
+    }
+
+    @Override
+    public UnixPath getRoot() {
+        if (path.length > 0 && path[0] == '/') {
+            return getFileSystem().rootDirectory();
+        } else {
+            return null;
+        }
+    }
+
+    @Override
+    public UnixPath getFileName() {
+        initOffsets();
+
+        int count = offsets.length;
+
+        // no elements so no name
+        if (count == 0)
+            return null;
+
+        // one name element and no root component
+        if (count == 1 && path.length > 0 && path[0] != '/')
+            return this;
+
+        int lastOffset = offsets[count-1];
+        int len = path.length - lastOffset;
+        byte[] result = new byte[len];
+        System.arraycopy(path, lastOffset, result, 0, len);
+        return new UnixPath(getFileSystem(), result);
+    }
+
+    @Override
+    public UnixPath getParent() {
+        initOffsets();
+
+        int count = offsets.length;
+        if (count == 0) {
+            // no elements so no parent
+            return null;
+        }
+        int len = offsets[count-1] - 1;
+        if (len <= 0) {
+            // parent is root only (may be null)
+            return getRoot();
+        }
+        byte[] result = new byte[len];
+        System.arraycopy(path, 0, result, 0, len);
+        return new UnixPath(getFileSystem(), result);
+    }
+
+    @Override
+    public int getNameCount() {
+        initOffsets();
+        return offsets.length;
+    }
+
+    @Override
+    public UnixPath getName(int index) {
+        initOffsets();
+        if (index < 0)
+            throw new IllegalArgumentException();
+        if (index >= offsets.length)
+            throw new IllegalArgumentException();
+
+        int begin = offsets[index];
+        int len;
+        if (index == (offsets.length-1)) {
+            len = path.length - begin;
+        } else {
+            len = offsets[index+1] - begin - 1;
+        }
+
+        // construct result
+        byte[] result = new byte[len];
+        System.arraycopy(path, begin, result, 0, len);
+        return new UnixPath(getFileSystem(), result);
+    }
+
+    @Override
+    public UnixPath subpath(int beginIndex, int endIndex) {
+        initOffsets();
+
+        if (beginIndex < 0)
+            throw new IllegalArgumentException();
+        if (beginIndex >= offsets.length)
+            throw new IllegalArgumentException();
+        if (endIndex > offsets.length)
+            throw new IllegalArgumentException();
+        if (beginIndex >= endIndex) {
+            throw new IllegalArgumentException();
+        }
+
+        // starting offset and length
+        int begin = offsets[beginIndex];
+        int len;
+        if (endIndex == offsets.length) {
+            len = path.length - begin;
+        } else {
+            len = offsets[endIndex] - begin - 1;
+        }
+
+        // construct result
+        byte[] result = new byte[len];
+        System.arraycopy(path, begin, result, 0, len);
+        return new UnixPath(getFileSystem(), result);
+    }
+
+    @Override
+    public boolean isAbsolute() {
+        return (path.length > 0 && path[0] == '/');
+    }
+
+    // Resolve child against given base
+    private static byte[] resolve(byte[] base, byte[] child) {
+        int baseLength = base.length;
+        int childLength = child.length;
+        if (childLength == 0)
+            return base;
+        if (baseLength == 0 || child[0] == '/')
+            return child;
+        byte[] result;
+        if (baseLength == 1 && base[0] == '/') {
+            result = new byte[childLength + 1];
+            result[0] = '/';
+            System.arraycopy(child, 0, result, 1, childLength);
+        } else {
+            result = new byte[baseLength + 1 + childLength];
+            System.arraycopy(base, 0, result, 0, baseLength);
+            result[base.length] = '/';
+            System.arraycopy(child, 0, result, baseLength+1, childLength);
+        }
+        return result;
+    }
+
+    @Override
+    public UnixPath resolve(Path obj) {
+        byte[] other = toUnixPath(obj).path;
+        if (other.length > 0 && other[0] == '/')
+            return ((UnixPath)obj);
+        byte[] result = resolve(path, other);
+        return new UnixPath(getFileSystem(), result);
+    }
+
+    UnixPath resolve(byte[] other) {
+        return resolve(new UnixPath(getFileSystem(), other));
+    }
+
+    @Override
+    public UnixPath relativize(Path obj) {
+        UnixPath child = toUnixPath(obj);
+        if (child.equals(this))
+            return emptyPath();
+
+        // can only relativize paths of the same type
+        if (this.isAbsolute() != child.isAbsolute())
+            throw new IllegalArgumentException("'other' is different type of Path");
+
+        // this path is the empty path
+        if (this.isEmpty())
+            return child;
+
+        UnixPath base = this;
+        if (base.hasDotOrDotDot() || child.hasDotOrDotDot()) {
+            base = base.normalize();
+            child = child.normalize();
+        }
+
+        int baseCount = base.getNameCount();
+        int childCount = child.getNameCount();
+
+        // skip matching names
+        int n = Math.min(baseCount, childCount);
+        int i = 0;
+        while (i < n) {
+            if (!base.getName(i).equals(child.getName(i)))
+                break;
+            i++;
+        }
+
+        // remaining elements in child
+        UnixPath childRemaining;
+        boolean isChildEmpty;
+        if (i == childCount) {
+            childRemaining = emptyPath();
+            isChildEmpty = true;
+        } else {
+            childRemaining = child.subpath(i, childCount);
+            isChildEmpty = childRemaining.isEmpty();
+        }
+
+        // matched all of base
+        if (i == baseCount) {
+            return childRemaining;
+        }
+
+        // the remainder of base cannot contain ".."
+        UnixPath baseRemaining = base.subpath(i, baseCount);
+        if (baseRemaining.hasDotOrDotDot()) {
+            throw new IllegalArgumentException("Unable to compute relative "
+                    + " path from " + this + " to " + obj);
+        }
+        if (baseRemaining.isEmpty())
+            return childRemaining;
+
+        // number of ".." needed
+        int dotdots = baseRemaining.getNameCount();
+        if (dotdots == 0) {
+            return childRemaining;
+        }
+
+        // result is a  "../" for each remaining name in base followed by the
+        // remaining names in child. If the remainder is the empty path
+        // then we don't add the final trailing slash.
+        int len = dotdots*3 + childRemaining.path.length;
+        if (isChildEmpty) {
+            assert childRemaining.isEmpty();
+            len--;
+        }
+        byte[] result = new byte[len];
+        int pos = 0;
+        while (dotdots > 0) {
+            result[pos++] = (byte)'.';
+            result[pos++] = (byte)'.';
+            if (isChildEmpty) {
+                if (dotdots > 1) result[pos++] = (byte)'/';
+            } else {
+                result[pos++] = (byte)'/';
+            }
+            dotdots--;
+        }
+        System.arraycopy(childRemaining.path,0, result, pos,
+                             childRemaining.path.length);
+        return new UnixPath(getFileSystem(), result);
+    }
+
+    @Override
+    public UnixPath normalize() {
+        final int count = getNameCount();
+        if (count == 0 || isEmpty())
+            return this;
+
+        boolean[] ignore = new boolean[count];      // true => ignore name
+        int[] size = new int[count];                // length of name
+        int remaining = count;                      // number of names remaining
+        boolean hasDotDot = false;                  // has at least one ..
+        boolean isAbsolute = isAbsolute();
+
+        // first pass:
+        //   1. compute length of names
+        //   2. mark all occurrences of "." to ignore
+        //   3. and look for any occurrences of ".."
+        for (int i=0; i<count; i++) {
+            int begin = offsets[i];
+            int len;
+            if (i == (offsets.length-1)) {
+                len = path.length - begin;
+            } else {
+                len = offsets[i+1] - begin - 1;
+            }
+            size[i] = len;
+
+            if (path[begin] == '.') {
+                if (len == 1) {
+                    ignore[i] = true;  // ignore  "."
+                    remaining--;
+                }
+                else {
+                    if (path[begin+1] == '.')   // ".." found
+                        hasDotDot = true;
+                }
+            }
+        }
+
+        // multiple passes to eliminate all occurrences of name/..
+        if (hasDotDot) {
+            int prevRemaining;
+            do {
+                prevRemaining = remaining;
+                int prevName = -1;
+                for (int i=0; i<count; i++) {
+                    if (ignore[i])
+                        continue;
+
+                    // not a ".."
+                    if (size[i] != 2) {
+                        prevName = i;
+                        continue;
+                    }
+
+                    int begin = offsets[i];
+                    if (path[begin] != '.' || path[begin+1] != '.') {
+                        prevName = i;
+                        continue;
+                    }
+
+                    // ".." found
+                    if (prevName >= 0) {
+                        // name/<ignored>/.. found so mark name and ".." to be
+                        // ignored
+                        ignore[prevName] = true;
+                        ignore[i] = true;
+                        remaining = remaining - 2;
+                        prevName = -1;
+                    } else {
+                        // Case: /<ignored>/.. so mark ".." as ignored
+                        if (isAbsolute) {
+                            boolean hasPrevious = false;
+                            for (int j=0; j<i; j++) {
+                                if (!ignore[j]) {
+                                    hasPrevious = true;
+                                    break;
+                                }
+                            }
+                            if (!hasPrevious) {
+                                // all proceeding names are ignored
+                                ignore[i] = true;
+                                remaining--;
+                            }
+                        }
+                    }
+                }
+            } while (prevRemaining > remaining);
+        }
+
+        // no redundant names
+        if (remaining == count)
+            return this;
+
+        // corner case - all names removed
+        if (remaining == 0) {
+            return isAbsolute ? getFileSystem().rootDirectory() : emptyPath();
+        }
+
+        // compute length of result
+        int len = remaining - 1;
+        if (isAbsolute)
+            len++;
+
+        for (int i=0; i<count; i++) {
+            if (!ignore[i])
+                len += size[i];
+        }
+        byte[] result = new byte[len];
+
+        // copy names into result
+        int pos = 0;
+        if (isAbsolute)
+            result[pos++] = '/';
+        for (int i=0; i<count; i++) {
+            if (!ignore[i]) {
+                System.arraycopy(path, offsets[i], result, pos, size[i]);
+                pos += size[i];
+                if (--remaining > 0) {
+                    result[pos++] = '/';
+                }
+            }
+        }
+        return new UnixPath(getFileSystem(), result);
+    }
+
+    @Override
+    public boolean startsWith(Path other) {
+        if (!(Objects.requireNonNull(other) instanceof UnixPath))
+            return false;
+        UnixPath that = (UnixPath)other;
+
+        // other path is longer
+        if (that.path.length > path.length)
+            return false;
+
+        int thisOffsetCount = getNameCount();
+        int thatOffsetCount = that.getNameCount();
+
+        // other path has no name elements
+        if (thatOffsetCount == 0 && this.isAbsolute()) {
+            return that.isEmpty() ? false : true;
+        }
+
+        // given path has more elements that this path
+        if (thatOffsetCount > thisOffsetCount)
+            return false;
+
+        // same number of elements so must be exact match
+        if ((thatOffsetCount == thisOffsetCount) &&
+            (path.length != that.path.length)) {
+            return false;
+        }
+
+        // check offsets of elements match
+        for (int i=0; i<thatOffsetCount; i++) {
+            Integer o1 = offsets[i];
+            Integer o2 = that.offsets[i];
+            if (!o1.equals(o2))
+                return false;
+        }
+
+        // offsets match so need to compare bytes
+        int i=0;
+        while (i < that.path.length) {
+            if (this.path[i] != that.path[i])
+                return false;
+            i++;
+        }
+
+        // final check that match is on name boundary
+        if (i < path.length && this.path[i] != '/')
+            return false;
+
+        return true;
+    }
+
+    @Override
+    public boolean endsWith(Path other) {
+        if (!(Objects.requireNonNull(other) instanceof UnixPath))
+            return false;
+        UnixPath that = (UnixPath)other;
+
+        int thisLen = path.length;
+        int thatLen = that.path.length;
+
+        // other path is longer
+        if (thatLen > thisLen)
+            return false;
+
+        // other path is the empty path
+        if (thisLen > 0 && thatLen == 0)
+            return false;
+
+        // other path is absolute so this path must be absolute
+        if (that.isAbsolute() && !this.isAbsolute())
+            return false;
+
+        int thisOffsetCount = getNameCount();
+        int thatOffsetCount = that.getNameCount();
+
+        // given path has more elements that this path
+        if (thatOffsetCount > thisOffsetCount) {
+            return false;
+        } else {
+            // same number of elements
+            if (thatOffsetCount == thisOffsetCount) {
+                if (thisOffsetCount == 0)
+                    return true;
+                int expectedLen = thisLen;
+                if (this.isAbsolute() && !that.isAbsolute())
+                    expectedLen--;
+                if (thatLen != expectedLen)
+                    return false;
+            } else {
+                // this path has more elements so given path must be relative
+                if (that.isAbsolute())
+                    return false;
+            }
+        }
+
+        // compare bytes
+        int thisPos = offsets[thisOffsetCount - thatOffsetCount];
+        int thatPos = that.offsets[0];
+        if ((thatLen - thatPos) != (thisLen - thisPos))
+            return false;
+        while (thatPos < thatLen) {
+            if (this.path[thisPos++] != that.path[thatPos++])
+                return false;
+        }
+
+        return true;
+    }
+
+    @Override
+    public int compareTo(Path other) {
+        int len1 = path.length;
+        int len2 = ((UnixPath) other).path.length;
+
+        int n = Math.min(len1, len2);
+        byte v1[] = path;
+        byte v2[] = ((UnixPath) other).path;
+
+        int k = 0;
+        while (k < n) {
+            int c1 = v1[k] & 0xff;
+            int c2 = v2[k] & 0xff;
+            if (c1 != c2) {
+                return c1 - c2;
+            }
+           k++;
+        }
+        return len1 - len2;
+    }
+
+    @Override
+    public boolean equals(Object ob) {
+        if ((ob != null) && (ob instanceof UnixPath)) {
+            return compareTo((Path)ob) == 0;
+        }
+        return false;
+    }
+
+    @Override
+    public int hashCode() {
+        // OK if two or more threads compute hash
+        int h = hash;
+        if (h == 0) {
+            for (int i = 0; i< path.length; i++) {
+                h = 31*h + (path[i] & 0xff);
+            }
+            hash = h;
+        }
+        return h;
+    }
+
+    @Override
+    public String toString() {
+        // OK if two or more threads create a String
+        if (stringValue == null) {
+            stringValue = fs.normalizeJavaPath(Util.toString(path));     // platform encoding
+        }
+        return stringValue;
+    }
+
+    // -- file operations --
+
+    // package-private
+    int openForAttributeAccess(boolean followLinks) throws UnixException {
+        int flags = O_RDONLY;
+        if (!followLinks) {
+            if (O_NOFOLLOW == 0)
+                throw new UnixException
+                    ("NOFOLLOW_LINKS is not supported on this platform");
+            flags |= O_NOFOLLOW;
+        }
+        try {
+            return open(this, flags, 0);
+        } catch (UnixException x) {
+            // HACK: EINVAL instead of ELOOP on Solaris 10 prior to u4 (see 6460380)
+            if (getFileSystem().isSolaris() && x.errno() == EINVAL)
+                x.setError(ELOOP);
+
+            throw x;
+        }
+    }
+
+    void checkRead() {
+        SecurityManager sm = System.getSecurityManager();
+        if (sm != null)
+            sm.checkRead(getPathForPermissionCheck());
+    }
+
+    void checkWrite() {
+        SecurityManager sm = System.getSecurityManager();
+        if (sm != null)
+            sm.checkWrite(getPathForPermissionCheck());
+    }
+
+    void checkDelete() {
+        SecurityManager sm = System.getSecurityManager();
+        if (sm != null)
+            sm.checkDelete(getPathForPermissionCheck());
+    }
+
+    @Override
+    public UnixPath toAbsolutePath() {
+        if (isAbsolute()) {
+            return this;
+        }
+        // The path is relative so need to resolve against default directory,
+        // taking care not to reveal the user.dir
+        SecurityManager sm = System.getSecurityManager();
+        if (sm != null) {
+            sm.checkPropertyAccess("user.dir");
+        }
+        return new UnixPath(getFileSystem(),
+            resolve(getFileSystem().defaultDirectory(), path));
+    }
+
+    @Override
+    public Path toRealPath(LinkOption... options) throws IOException {
+        checkRead();
+
+        UnixPath absolute = toAbsolutePath();
+
+        // if resolving links then use realpath
+        if (Util.followLinks(options)) {
+            try {
+                byte[] rp = realpath(absolute);
+                return new UnixPath(getFileSystem(), rp);
+            } catch (UnixException x) {
+                x.rethrowAsIOException(this);
+            }
+        }
+
+        // if not resolving links then eliminate "." and also ".."
+        // where the previous element is not a link.
+        UnixPath result = fs.rootDirectory();
+        for (int i=0; i<absolute.getNameCount(); i++) {
+            UnixPath element = absolute.getName(i);
+
+            // eliminate "."
+            if ((element.asByteArray().length == 1) && (element.asByteArray()[0] == '.'))
+                continue;
+
+            // cannot eliminate ".." if previous element is a link
+            if ((element.asByteArray().length == 2) && (element.asByteArray()[0] == '.') &&
+                (element.asByteArray()[1] == '.'))
+            {
+                UnixFileAttributes attrs = null;
+                try {
+                    attrs = UnixFileAttributes.get(result, false);
+                } catch (UnixException x) {
+                    x.rethrowAsIOException(result);
+                }
+                if (!attrs.isSymbolicLink()) {
+                    result = result.getParent();
+                    if (result == null) {
+                        result = fs.rootDirectory();
+                    }
+                    continue;
+                }
+            }
+            result = result.resolve(element);
+        }
+
+        // check file exists (without following links)
+        try {
+            UnixFileAttributes.get(result, false);
+        } catch (UnixException x) {
+            x.rethrowAsIOException(result);
+        }
+        return result;
+    }
+
+    @Override
+    public URI toUri() {
+        return UnixUriUtils.toUri(this);
+    }
+
+    @Override
+    public WatchKey register(WatchService watcher,
+                             WatchEvent.Kind<?>[] events,
+                             WatchEvent.Modifier... modifiers)
+        throws IOException
+    {
+        if (watcher == null)
+            throw new NullPointerException();
+        if (!(watcher instanceof AbstractWatchService))
+            throw new ProviderMismatchException();
+        checkRead();
+        return ((AbstractWatchService)watcher).register(this, events, modifiers);
+    }
+}

src/java.base/unix/classes/sun/nio/fs/UnixSecureDirectoryStream.java

@@ -0,0 +1,557 @@
+/*
+ * Copyright (c) 2008, 2011, 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;
+
+import java.nio.file.*;
+import java.nio.file.attribute.*;
+import java.nio.channels.SeekableByteChannel;
+import java.util.*;
+import java.util.concurrent.TimeUnit;
+import java.io.IOException;
+
+import static sun.nio.fs.UnixNativeDispatcher.*;
+import static sun.nio.fs.UnixConstants.*;
+
+/**
+ * Unix implementation of SecureDirectoryStream.
+ */
+
+class UnixSecureDirectoryStream
+    implements SecureDirectoryStream<Path>
+{
+    private final UnixDirectoryStream ds;
+    private final int dfd;
+
+    UnixSecureDirectoryStream(UnixPath dir,
+                              long dp,
+                              int dfd,
+                              DirectoryStream.Filter<? super Path> filter)
+    {
+        this.ds = new UnixDirectoryStream(dir, dp, filter);
+        this.dfd = dfd;
+    }
+
+    @Override
+    public void close()
+        throws IOException
+    {
+        ds.writeLock().lock();
+        try {
+            if (ds.closeImpl()) {
+                UnixNativeDispatcher.close(dfd);
+            }
+        } finally {
+            ds.writeLock().unlock();
+        }
+    }
+
+    @Override
+    public Iterator<Path> iterator() {
+        return ds.iterator(this);
+    }
+
+    private UnixPath getName(Path obj) {
+        if (obj == null)
+            throw new NullPointerException();
+        if (!(obj instanceof UnixPath))
+            throw new ProviderMismatchException();
+        return (UnixPath)obj;
+    }
+
+    /**
+     * Opens sub-directory in this directory
+     */
+    @Override
+    public SecureDirectoryStream<Path> newDirectoryStream(Path obj,
+                                                          LinkOption... options)
+        throws IOException
+    {
+        UnixPath file = getName(obj);
+        UnixPath child = ds.directory().resolve(file);
+        boolean followLinks = Util.followLinks(options);
+
+        // permission check using name resolved against original path of directory
+        SecurityManager sm = System.getSecurityManager();
+        if (sm != null) {
+            child.checkRead();
+        }
+
+        ds.readLock().lock();
+        try {
+            if (!ds.isOpen())
+                throw new ClosedDirectoryStreamException();
+
+            // open directory and create new secure directory stream
+            int newdfd1 = -1;
+            int newdfd2 = -1;
+            long ptr = 0L;
+            try {
+                int flags = O_RDONLY;
+                if (!followLinks)
+                    flags |= O_NOFOLLOW;
+                newdfd1 = openat(dfd, file.asByteArray(), flags , 0);
+                newdfd2 = dup(newdfd1);
+                ptr = fdopendir(newdfd1);
+            } catch (UnixException x) {
+                if (newdfd1 != -1)
+                    UnixNativeDispatcher.close(newdfd1);
+                if (newdfd2 != -1)
+                    UnixNativeDispatcher.close(newdfd2);
+                if (x.errno() == UnixConstants.ENOTDIR)
+                    throw new NotDirectoryException(file.toString());
+                x.rethrowAsIOException(file);
+            }
+            return new UnixSecureDirectoryStream(child, ptr, newdfd2, null);
+        } finally {
+            ds.readLock().unlock();
+        }
+    }
+
+    /**
+     * Opens file in this directory
+     */
+    @Override
+    public SeekableByteChannel newByteChannel(Path obj,
+                                              Set<? extends OpenOption> options,
+                                              FileAttribute<?>... attrs)
+        throws IOException
+    {
+        UnixPath file = getName(obj);
+
+        int mode = UnixFileModeAttribute
+            .toUnixMode(UnixFileModeAttribute.ALL_READWRITE, attrs);
+
+        // path for permission check
+        String pathToCheck = ds.directory().resolve(file).getPathForPermissionCheck();
+
+        ds.readLock().lock();
+        try {
+            if (!ds.isOpen())
+                throw new ClosedDirectoryStreamException();
+            try {
+                return UnixChannelFactory.newFileChannel(dfd, file, pathToCheck, options, mode);
+            } catch (UnixException x) {
+                x.rethrowAsIOException(file);
+                return null; // keep compiler happy
+            }
+        } finally {
+            ds.readLock().unlock();
+        }
+    }
+
+    /**
+     * Deletes file/directory in this directory. Works in a race-free manner
+     * when invoked with flags.
+     */
+    private void implDelete(Path obj, boolean haveFlags, int flags)
+        throws IOException
+    {
+        UnixPath file = getName(obj);
+
+        // permission check using name resolved against original path of directory
+        SecurityManager sm = System.getSecurityManager();
+        if (sm != null) {
+            ds.directory().resolve(file).checkDelete();
+        }
+
+        ds.readLock().lock();
+        try {
+            if (!ds.isOpen())
+                throw new ClosedDirectoryStreamException();
+
+            if (!haveFlags) {
+                // need file attribute to know if file is directory. This creates
+                // a race in that the file may be replaced by a directory or a
+                // directory replaced by a file between the time we query the
+                // file type and unlink it.
+                UnixFileAttributes attrs = null;
+                try {
+                    attrs = UnixFileAttributes.get(dfd, file, false);
+                } catch (UnixException x) {
+                    x.rethrowAsIOException(file);
+                }
+                flags = (attrs.isDirectory()) ? AT_REMOVEDIR : 0;
+            }
+
+            try {
+                unlinkat(dfd, file.asByteArray(), flags);
+            } catch (UnixException x) {
+                if ((flags & AT_REMOVEDIR) != 0) {
+                    if (x.errno() == EEXIST || x.errno() == ENOTEMPTY) {
+                        throw new DirectoryNotEmptyException(null);
+                    }
+                }
+                x.rethrowAsIOException(file);
+            }
+        } finally {
+            ds.readLock().unlock();
+        }
+    }
+
+    @Override
+    public void deleteFile(Path file) throws IOException {
+        implDelete(file, true, 0);
+    }
+
+    @Override
+    public void deleteDirectory(Path dir) throws IOException {
+        implDelete(dir, true, AT_REMOVEDIR);
+    }
+
+    /**
+     * Rename/move file in this directory to another (open) directory
+     */
+    @Override
+    public void move(Path fromObj, SecureDirectoryStream<Path> dir, Path toObj)
+        throws IOException
+    {
+        UnixPath from = getName(fromObj);
+        UnixPath to = getName(toObj);
+        if (dir == null)
+            throw new NullPointerException();
+        if (!(dir instanceof UnixSecureDirectoryStream))
+            throw new ProviderMismatchException();
+        UnixSecureDirectoryStream that = (UnixSecureDirectoryStream)dir;
+
+        // permission check
+        SecurityManager sm = System.getSecurityManager();
+        if (sm != null) {
+            this.ds.directory().resolve(from).checkWrite();
+            that.ds.directory().resolve(to).checkWrite();
+        }
+
+        // lock ordering doesn't matter
+        this.ds.readLock().lock();
+        try {
+            that.ds.readLock().lock();
+            try {
+                if (!this.ds.isOpen() || !that.ds.isOpen())
+                    throw new ClosedDirectoryStreamException();
+                try {
+                    renameat(this.dfd, from.asByteArray(), that.dfd, to.asByteArray());
+                } catch (UnixException x) {
+                    if (x.errno() == EXDEV) {
+                        throw new AtomicMoveNotSupportedException(
+                            from.toString(), to.toString(), x.errorString());
+                    }
+                    x.rethrowAsIOException(from, to);
+                }
+            } finally {
+                that.ds.readLock().unlock();
+            }
+        } finally {
+            this.ds.readLock().unlock();
+        }
+    }
+
+    @SuppressWarnings("unchecked")
+    private <V extends FileAttributeView> V getFileAttributeViewImpl(UnixPath file,
+                                                                     Class<V> type,
+                                                                     boolean followLinks)
+    {
+        if (type == null)
+            throw new NullPointerException();
+        Class<?> c = type;
+        if (c == BasicFileAttributeView.class) {
+            return (V) new BasicFileAttributeViewImpl(file, followLinks);
+        }
+        if (c == PosixFileAttributeView.class || c == FileOwnerAttributeView.class) {
+            return (V) new PosixFileAttributeViewImpl(file, followLinks);
+        }
+        // TBD - should also support AclFileAttributeView
+        return (V) null;
+    }
+
+    /**
+     * Returns file attribute view bound to this directory
+     */
+    @Override
+    public <V extends FileAttributeView> V getFileAttributeView(Class<V> type) {
+        return getFileAttributeViewImpl(null, type, false);
+    }
+
+    /**
+     * Returns file attribute view bound to dfd/filename.
+     */
+    @Override
+    public <V extends FileAttributeView> V getFileAttributeView(Path obj,
+                                                                Class<V> type,
+                                                                LinkOption... options)
+    {
+        UnixPath file = getName(obj);
+        boolean followLinks = Util.followLinks(options);
+        return getFileAttributeViewImpl(file, type, followLinks);
+    }
+
+    /**
+     * A BasicFileAttributeView implementation that using a dfd/name pair.
+     */
+    private class BasicFileAttributeViewImpl
+        implements BasicFileAttributeView
+    {
+        final UnixPath file;
+        final boolean followLinks;
+
+        BasicFileAttributeViewImpl(UnixPath file, boolean followLinks)
+        {
+            this.file = file;
+            this.followLinks = followLinks;
+        }
+
+        int open() throws IOException {
+            int oflags = O_RDONLY;
+            if (!followLinks)
+                oflags |= O_NOFOLLOW;
+            try {
+                return openat(dfd, file.asByteArray(), oflags, 0);
+            } catch (UnixException x) {
+                x.rethrowAsIOException(file);
+                return -1; // keep compiler happy
+            }
+        }
+
+        private void checkWriteAccess() {
+            SecurityManager sm = System.getSecurityManager();
+            if (sm != null) {
+                if (file == null) {
+                    ds.directory().checkWrite();
+                } else {
+                    ds.directory().resolve(file).checkWrite();
+                }
+            }
+        }
+
+        @Override
+        public String name() {
+            return "basic";
+        }
+
+        @Override
+        public BasicFileAttributes readAttributes() throws IOException {
+            ds.readLock().lock();
+            try {
+                if (!ds.isOpen())
+                    throw new ClosedDirectoryStreamException();
+
+                SecurityManager sm = System.getSecurityManager();
+                if (sm != null) {
+                    if (file == null) {
+                        ds.directory().checkRead();
+                    } else {
+                        ds.directory().resolve(file).checkRead();
+                    }
+                }
+                try {
+                     UnixFileAttributes attrs = (file == null) ?
+                         UnixFileAttributes.get(dfd) :
+                         UnixFileAttributes.get(dfd, file, followLinks);
+
+                     // SECURITY: must return as BasicFileAttribute
+                     return attrs.asBasicFileAttributes();
+                } catch (UnixException x) {
+                    x.rethrowAsIOException(file);
+                    return null;    // keep compiler happy
+                }
+            } finally {
+                ds.readLock().unlock();
+            }
+        }
+
+        @Override
+        public void setTimes(FileTime lastModifiedTime,
+                             FileTime lastAccessTime,
+                             FileTime createTime) // ignore
+            throws IOException
+        {
+            checkWriteAccess();
+
+            ds.readLock().lock();
+            try {
+                if (!ds.isOpen())
+                    throw new ClosedDirectoryStreamException();
+
+                int fd = (file == null) ? dfd : open();
+                try {
+                    // if not changing both attributes then need existing attributes
+                    if (lastModifiedTime == null || lastAccessTime == null) {
+                        try {
+                            UnixFileAttributes attrs = UnixFileAttributes.get(fd);
+                            if (lastModifiedTime == null)
+                                lastModifiedTime = attrs.lastModifiedTime();
+                            if (lastAccessTime == null)
+                                lastAccessTime = attrs.lastAccessTime();
+                        } catch (UnixException x) {
+                            x.rethrowAsIOException(file);
+                        }
+                    }
+                    // update times
+                    try {
+                        futimes(fd,
+                                lastAccessTime.to(TimeUnit.MICROSECONDS),
+                                lastModifiedTime.to(TimeUnit.MICROSECONDS));
+                    } catch (UnixException x) {
+                        x.rethrowAsIOException(file);
+                    }
+                } finally {
+                    if (file != null)
+                        UnixNativeDispatcher.close(fd);
+                }
+            } finally {
+                ds.readLock().unlock();
+            }
+        }
+    }
+
+    /**
+     * A PosixFileAttributeView implementation that using a dfd/name pair.
+     */
+    private class PosixFileAttributeViewImpl
+        extends BasicFileAttributeViewImpl implements PosixFileAttributeView
+    {
+        PosixFileAttributeViewImpl(UnixPath file, boolean followLinks) {
+            super(file, followLinks);
+        }
+
+        private void checkWriteAndUserAccess() {
+            SecurityManager sm = System.getSecurityManager();
+            if (sm != null) {
+                super.checkWriteAccess();
+                sm.checkPermission(new RuntimePermission("accessUserInformation"));
+            }
+        }
+
+        @Override
+        public String name() {
+            return "posix";
+        }
+
+        @Override
+        public PosixFileAttributes readAttributes() throws IOException {
+            SecurityManager sm = System.getSecurityManager();
+            if (sm != null) {
+                if (file == null)
+                    ds.directory().checkRead();
+                else
+                    ds.directory().resolve(file).checkRead();
+                sm.checkPermission(new RuntimePermission("accessUserInformation"));
+            }
+
+            ds.readLock().lock();
+            try {
+                if (!ds.isOpen())
+                    throw new ClosedDirectoryStreamException();
+
+                try {
+                     UnixFileAttributes attrs = (file == null) ?
+                         UnixFileAttributes.get(dfd) :
+                         UnixFileAttributes.get(dfd, file, followLinks);
+                     return attrs;
+                } catch (UnixException x) {
+                    x.rethrowAsIOException(file);
+                    return null;    // keep compiler happy
+                }
+            } finally {
+                ds.readLock().unlock();
+            }
+        }
+
+        @Override
+        public void setPermissions(Set<PosixFilePermission> perms)
+            throws IOException
+        {
+            // permission check
+            checkWriteAndUserAccess();
+
+            ds.readLock().lock();
+            try {
+                if (!ds.isOpen())
+                    throw new ClosedDirectoryStreamException();
+
+                int fd = (file == null) ? dfd : open();
+                try {
+                    fchmod(fd, UnixFileModeAttribute.toUnixMode(perms));
+                } catch (UnixException x) {
+                    x.rethrowAsIOException(file);
+                } finally {
+                    if (file != null && fd >= 0)
+                        UnixNativeDispatcher.close(fd);
+                }
+            } finally {
+                ds.readLock().unlock();
+            }
+        }
+
+        private void setOwners(int uid, int gid) throws IOException {
+            // permission check
+            checkWriteAndUserAccess();
+
+            ds.readLock().lock();
+            try {
+                if (!ds.isOpen())
+                    throw new ClosedDirectoryStreamException();
+
+                int fd = (file == null) ? dfd : open();
+                try {
+                    fchown(fd, uid, gid);
+                } catch (UnixException x) {
+                    x.rethrowAsIOException(file);
+                } finally {
+                    if (file != null && fd >= 0)
+                        UnixNativeDispatcher.close(fd);
+                }
+            } finally {
+                ds.readLock().unlock();
+            }
+        }
+
+        @Override
+        public UserPrincipal getOwner() throws IOException {
+            return readAttributes().owner();
+        }
+
+        @Override
+        public void setOwner(UserPrincipal owner)
+            throws IOException
+        {
+            if (!(owner instanceof UnixUserPrincipals.User))
+                throw new ProviderMismatchException();
+            if (owner instanceof UnixUserPrincipals.Group)
+                throw new IOException("'owner' parameter can't be a group");
+            int uid = ((UnixUserPrincipals.User)owner).uid();
+            setOwners(uid, -1);
+        }
+
+        @Override
+        public void setGroup(GroupPrincipal group)
+            throws IOException
+        {
+            if (!(group instanceof UnixUserPrincipals.Group))
+                throw new ProviderMismatchException();
+            int gid = ((UnixUserPrincipals.Group)group).gid();
+            setOwners(-1, gid);
+        }
+    }
+}

src/java.base/unix/classes/sun/nio/fs/UnixUriUtils.java

@@ -0,0 +1,246 @@
+/*
+ * Copyright (c) 2008, 2013, 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;
+
+import java.nio.file.Path;
+import java.io.File;
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.util.Arrays;
+
+/**
+ * Unix specific Path <--> URI conversion
+ */
+
+class UnixUriUtils {
+    private UnixUriUtils() { }
+
+    /**
+     * Converts URI to Path
+     */
+    static Path fromUri(UnixFileSystem fs, URI uri) {
+        if (!uri.isAbsolute())
+            throw new IllegalArgumentException("URI is not absolute");
+        if (uri.isOpaque())
+            throw new IllegalArgumentException("URI is not hierarchical");
+        String scheme = uri.getScheme();
+        if ((scheme == null) || !scheme.equalsIgnoreCase("file"))
+            throw new IllegalArgumentException("URI scheme is not \"file\"");
+        if (uri.getRawAuthority() != null)
+            throw new IllegalArgumentException("URI has an authority component");
+        if (uri.getRawFragment() != null)
+            throw new IllegalArgumentException("URI has a fragment component");
+        if (uri.getRawQuery() != null)
+            throw new IllegalArgumentException("URI has a query component");
+
+        // compatibility with java.io.File
+        if (!uri.toString().startsWith("file:///"))
+            return new File(uri).toPath();
+
+        // transformation use raw path
+        String p = uri.getRawPath();
+        int len = p.length();
+        if (len == 0)
+            throw new IllegalArgumentException("URI path component is empty");
+
+        // transform escaped octets and unescaped characters to bytes
+        if (p.endsWith("/") && len > 1)
+            len--;
+        byte[] result = new byte[len];
+        int rlen = 0;
+        int pos = 0;
+        while (pos < len) {
+            char c = p.charAt(pos++);
+            byte b;
+            if (c == '%') {
+                assert (pos+2) <= len;
+                char c1 = p.charAt(pos++);
+                char c2 = p.charAt(pos++);
+                b = (byte)((decode(c1) << 4) | decode(c2));
+                if (b == 0)
+                    throw new IllegalArgumentException("Nul character not allowed");
+            } else {
+                assert c < 0x80;
+                b = (byte)c;
+            }
+            result[rlen++] = b;
+        }
+        if (rlen != result.length)
+            result = Arrays.copyOf(result, rlen);
+
+        return new UnixPath(fs, result);
+    }
+
+    /**
+     * Converts Path to URI
+     */
+    static URI toUri(UnixPath up) {
+        byte[] path = up.toAbsolutePath().asByteArray();
+        StringBuilder sb = new StringBuilder("file:///");
+        assert path[0] == '/';
+        for (int i=1; i<path.length; i++) {
+            char c = (char)(path[i] & 0xff);
+            if (match(c, L_PATH, H_PATH)) {
+                sb.append(c);
+            } else {
+               sb.append('%');
+               sb.append(hexDigits[(c >> 4) & 0x0f]);
+               sb.append(hexDigits[(c) & 0x0f]);
+            }
+        }
+
+        // trailing slash if directory
+        if (sb.charAt(sb.length()-1) != '/') {
+            int mode = UnixNativeDispatcher.stat(up);
+            if ((mode & UnixConstants.S_IFMT) == UnixConstants.S_IFDIR)
+                sb.append('/');
+        }
+
+        try {
+            return new URI(sb.toString());
+        } catch (URISyntaxException x) {
+            throw new AssertionError(x);  // should not happen
+        }
+    }
+
+    // The following is copied from java.net.URI
+
+    // Compute the low-order mask for the characters in the given string
+    private static long lowMask(String chars) {
+        int n = chars.length();
+        long m = 0;
+        for (int i = 0; i < n; i++) {
+            char c = chars.charAt(i);
+            if (c < 64)
+                m |= (1L << c);
+        }
+        return m;
+    }
+
+    // Compute the high-order mask for the characters in the given string
+    private static long highMask(String chars) {
+        int n = chars.length();
+        long m = 0;
+        for (int i = 0; i < n; i++) {
+            char c = chars.charAt(i);
+            if ((c >= 64) && (c < 128))
+                m |= (1L << (c - 64));
+        }
+        return m;
+    }
+
+    // Compute a low-order mask for the characters
+    // between first and last, inclusive
+    private static long lowMask(char first, char last) {
+        long m = 0;
+        int f = Math.max(Math.min(first, 63), 0);
+        int l = Math.max(Math.min(last, 63), 0);
+        for (int i = f; i <= l; i++)
+            m |= 1L << i;
+        return m;
+    }
+
+    // Compute a high-order mask for the characters
+    // between first and last, inclusive
+    private static long highMask(char first, char last) {
+        long m = 0;
+        int f = Math.max(Math.min(first, 127), 64) - 64;
+        int l = Math.max(Math.min(last, 127), 64) - 64;
+        for (int i = f; i <= l; i++)
+            m |= 1L << i;
+        return m;
+    }
+
+    // Tell whether the given character is permitted by the given mask pair
+    private static boolean match(char c, long lowMask, long highMask) {
+        if (c < 64)
+            return ((1L << c) & lowMask) != 0;
+        if (c < 128)
+            return ((1L << (c - 64)) & highMask) != 0;
+        return false;
+    }
+
+    // decode
+    private static int decode(char c) {
+        if ((c >= '0') && (c <= '9'))
+            return c - '0';
+        if ((c >= 'a') && (c <= 'f'))
+            return c - 'a' + 10;
+        if ((c >= 'A') && (c <= 'F'))
+            return c - 'A' + 10;
+        throw new AssertionError();
+    }
+
+    // digit    = "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" |
+    //            "8" | "9"
+    private static final long L_DIGIT = lowMask('0', '9');
+    private static final long H_DIGIT = 0L;
+
+    // upalpha  = "A" | "B" | "C" | "D" | "E" | "F" | "G" | "H" | "I" |
+    //            "J" | "K" | "L" | "M" | "N" | "O" | "P" | "Q" | "R" |
+    //            "S" | "T" | "U" | "V" | "W" | "X" | "Y" | "Z"
+    private static final long L_UPALPHA = 0L;
+    private static final long H_UPALPHA = highMask('A', 'Z');
+
+    // lowalpha = "a" | "b" | "c" | "d" | "e" | "f" | "g" | "h" | "i" |
+    //            "j" | "k" | "l" | "m" | "n" | "o" | "p" | "q" | "r" |
+    //            "s" | "t" | "u" | "v" | "w" | "x" | "y" | "z"
+    private static final long L_LOWALPHA = 0L;
+    private static final long H_LOWALPHA = highMask('a', 'z');
+
+    // alpha         = lowalpha | upalpha
+    private static final long L_ALPHA = L_LOWALPHA | L_UPALPHA;
+    private static final long H_ALPHA = H_LOWALPHA | H_UPALPHA;
+
+    // alphanum      = alpha | digit
+    private static final long L_ALPHANUM = L_DIGIT | L_ALPHA;
+    private static final long H_ALPHANUM = H_DIGIT | H_ALPHA;
+
+    // mark          = "-" | "_" | "." | "!" | "~" | "*" | "'" |
+    //                 "(" | ")"
+    private static final long L_MARK = lowMask("-_.!~*'()");
+    private static final long H_MARK = highMask("-_.!~*'()");
+
+    // unreserved    = alphanum | mark
+    private static final long L_UNRESERVED = L_ALPHANUM | L_MARK;
+    private static final long H_UNRESERVED = H_ALPHANUM | H_MARK;
+
+    // pchar         = unreserved | escaped |
+    //                 ":" | "@" | "&" | "=" | "+" | "$" | ","
+    private static final long L_PCHAR
+        = L_UNRESERVED | lowMask(":@&=+$,");
+    private static final long H_PCHAR
+        = H_UNRESERVED | highMask(":@&=+$,");
+
+   // All valid path characters
+   private static final long L_PATH = L_PCHAR | lowMask(";/");
+   private static final long H_PATH = H_PCHAR | highMask(";/");
+
+   private static final char[] hexDigits = {
+        '0', '1', '2', '3', '4', '5', '6', '7',
+        '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
+    };
+}

src/java.base/unix/classes/sun/nio/fs/UnixUserPrincipals.java

@@ -0,0 +1,181 @@
+/*
+ * Copyright (c) 2008, 2013, 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;
+
+import java.nio.file.attribute.*;
+import java.io.IOException;
+import static sun.nio.fs.UnixNativeDispatcher.*;
+
+/**
+ * Unix implementation of java.nio.file.attribute.UserPrincipal
+ */
+
+class UnixUserPrincipals {
+    private static User createSpecial(String name) { return new User(-1, name); }
+
+    static final User SPECIAL_OWNER = createSpecial("OWNER@");
+    static final User SPECIAL_GROUP = createSpecial("GROUP@");
+    static final User SPECIAL_EVERYONE = createSpecial("EVERYONE@");
+
+    static class User implements UserPrincipal {
+        private final int id;             // uid or gid
+        private final boolean isGroup;
+        private final String name;
+
+        private User(int id, boolean isGroup, String name) {
+            this.id = id;
+            this.isGroup = isGroup;
+            this.name = name;
+        }
+
+        User(int id, String name) {
+            this(id, false, name);
+        }
+
+        int uid() {
+            if (isGroup)
+                throw new AssertionError();
+            return id;
+        }
+
+        int gid() {
+            if (isGroup)
+                return id;
+            throw new AssertionError();
+        }
+
+        boolean isSpecial() {
+            return id == -1;
+        }
+
+        @Override
+        public String getName() {
+            return name;
+        }
+
+        @Override
+        public String toString() {
+            return name;
+        }
+
+        @Override
+        public boolean equals(Object obj) {
+            if (obj == this)
+                return true;
+            if (!(obj instanceof User))
+                return false;
+            User other = (User)obj;
+            if ((this.id != other.id) ||
+                (this.isGroup != other.isGroup)) {
+                return false;
+            }
+            // specials
+            if (this.id == -1 && other.id == -1)
+                return this.name.equals(other.name);
+
+            return true;
+        }
+
+        @Override
+        public int hashCode() {
+            return (id != -1) ? id : name.hashCode();
+        }
+    }
+
+    static class Group extends User implements GroupPrincipal {
+        Group(int id, String name) {
+            super(id, true, name);
+        }
+    }
+
+    // return UserPrincipal representing given uid
+    static User fromUid(int uid) {
+        String name = null;
+        try {
+            name = Util.toString(getpwuid(uid));
+        } catch (UnixException x) {
+            name = Integer.toString(uid);
+        }
+        return new User(uid, name);
+    }
+
+    // return GroupPrincipal representing given gid
+    static Group fromGid(int gid) {
+        String name = null;
+        try {
+            name = Util.toString(getgrgid(gid));
+        } catch (UnixException x) {
+            name = Integer.toString(gid);
+        }
+        return new Group(gid, name);
+    }
+
+    // lookup user or group name
+    private static int lookupName(String name, boolean isGroup)
+        throws IOException
+    {
+        SecurityManager sm = System.getSecurityManager();
+        if (sm != null) {
+            sm.checkPermission(new RuntimePermission("lookupUserInformation"));
+        }
+        int id = -1;
+        try {
+            id = (isGroup) ? getgrnam(name) : getpwnam(name);
+        } catch (UnixException x) {
+            throw new IOException(name + ": " + x.errorString());
+        }
+        if (id == -1) {
+            // lookup failed, allow input to be uid or gid
+            try {
+                id = Integer.parseInt(name);
+            } catch (NumberFormatException ignore) {
+                throw new UserPrincipalNotFoundException(name);
+            }
+        }
+        return id;
+
+    }
+
+    // lookup user name
+    static UserPrincipal lookupUser(String name) throws IOException {
+        if (name.equals(SPECIAL_OWNER.getName()))
+            return SPECIAL_OWNER;
+        if (name.equals(SPECIAL_GROUP.getName()))
+            return SPECIAL_GROUP;
+        if (name.equals(SPECIAL_EVERYONE.getName()))
+            return SPECIAL_EVERYONE;
+        int uid = lookupName(name, false);
+        return new User(uid, name);
+    }
+
+    // lookup group name
+    static GroupPrincipal lookupGroup(String group)
+        throws IOException
+    {
+        int gid = lookupName(group, true);
+        return new Group(gid, group);
+    }
+}