8187443: Forest Consolidation: Move files to unified layout

Reviewed-by: darcy, ihse

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;
+    }
+}