author | erikj |
Tue, 12 Sep 2017 19:03:39 +0200 | |
changeset 47216 | 71c04702a3d5 |
parent 34537 | jdk/src/java.base/linux/classes/sun/nio/fs/LinuxFileStore.java@ca5ca0e04c96 |
child 48460 | bdbbf56c302e |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2008, 2015, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package sun.nio.fs; |
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import java.nio.file.attribute.*; |
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import java.util.*; |
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import java.io.IOException; |
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/** |
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* Linux implementation of FileStore |
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*/ |
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class LinuxFileStore |
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extends UnixFileStore |
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{ |
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// used when checking if extended attributes are enabled or not |
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private volatile boolean xattrChecked; |
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private volatile boolean xattrEnabled; |
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|
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LinuxFileStore(UnixPath file) throws IOException { |
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super(file); |
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} |
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LinuxFileStore(UnixFileSystem fs, UnixMountEntry entry) throws IOException { |
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super(fs, entry); |
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} |
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/** |
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* Finds, and returns, the mount entry for the file system where the file |
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* resides. |
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*/ |
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@Override |
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UnixMountEntry findMountEntry() throws IOException { |
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LinuxFileSystem fs = (LinuxFileSystem)file().getFileSystem(); |
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// step 1: get realpath |
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UnixPath path = null; |
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try { |
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byte[] rp = UnixNativeDispatcher.realpath(file()); |
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path = new UnixPath(fs, rp); |
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} catch (UnixException x) { |
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x.rethrowAsIOException(file()); |
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} |
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// step 2: find mount point |
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UnixPath parent = path.getParent(); |
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while (parent != null) { |
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UnixFileAttributes attrs = null; |
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try { |
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attrs = UnixFileAttributes.get(parent, true); |
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} catch (UnixException x) { |
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x.rethrowAsIOException(parent); |
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} |
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if (attrs.dev() != dev()) |
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break; |
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path = parent; |
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parent = parent.getParent(); |
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} |
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// step 3: lookup mounted file systems (use /proc/mounts to ensure we |
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// find the file system even when not in /etc/mtab) |
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byte[] dir = path.asByteArray(); |
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for (UnixMountEntry entry: fs.getMountEntries("/proc/mounts")) { |
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if (Arrays.equals(dir, entry.dir())) |
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return entry; |
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} |
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throw new IOException("Mount point not found"); |
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} |
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// returns true if extended attributes enabled on file system where given |
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// file resides, returns false if disabled or unable to determine. |
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private boolean isExtendedAttributesEnabled(UnixPath path) { |
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int fd = -1; |
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try { |
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fd = path.openForAttributeAccess(false); |
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// fgetxattr returns size if called with size==0 |
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byte[] name = Util.toBytes("user.java"); |
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LinuxNativeDispatcher.fgetxattr(fd, name, 0L, 0); |
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return true; |
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} catch (UnixException e) { |
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// attribute does not exist |
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if (e.errno() == UnixConstants.ENODATA) |
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return true; |
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} finally { |
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UnixNativeDispatcher.close(fd); |
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} |
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return false; |
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} |
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@Override |
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public boolean supportsFileAttributeView(Class<? extends FileAttributeView> type) { |
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// support DosFileAttributeView and UserDefinedAttributeView if extended |
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// attributes enabled |
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if (type == DosFileAttributeView.class || |
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type == UserDefinedFileAttributeView.class) |
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{ |
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// lookup fstypes.properties |
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FeatureStatus status = checkIfFeaturePresent("user_xattr"); |
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if (status == FeatureStatus.PRESENT) |
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return true; |
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if (status == FeatureStatus.NOT_PRESENT) |
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return false; |
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128 |
|
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// if file system is mounted with user_xattr option then assume |
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// extended attributes are enabled |
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if ((entry().hasOption("user_xattr"))) |
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return true; |
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133 |
|
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// user_xattr option not present but we special-case ext3/4 as we |
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// know that extended attributes are not enabled by default. |
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if (entry().fstype().equals("ext3") || entry().fstype().equals("ext4")) |
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return false; |
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138 |
|
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// not ext3/4 so probe mount point |
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if (!xattrChecked) { |
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UnixPath dir = new UnixPath(file().getFileSystem(), entry().dir()); |
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xattrEnabled = isExtendedAttributesEnabled(dir); |
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xattrChecked = true; |
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} |
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return xattrEnabled; |
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} |
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// POSIX attributes not supported on FAT |
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if (type == PosixFileAttributeView.class && entry().fstype().equals("vfat")) |
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return false; |
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return super.supportsFileAttributeView(type); |
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} |
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|
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@Override |
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public boolean supportsFileAttributeView(String name) { |
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if (name.equals("dos")) |
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return supportsFileAttributeView(DosFileAttributeView.class); |
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if (name.equals("user")) |
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return supportsFileAttributeView(UserDefinedFileAttributeView.class); |
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return super.supportsFileAttributeView(name); |
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} |
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} |