| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.cassandra.utils; |
| |
| import java.io.File; |
| import java.io.FileDescriptor; |
| import java.io.FileInputStream; |
| import java.io.IOException; |
| import java.lang.reflect.Field; |
| import java.nio.channels.FileChannel; |
| import java.nio.file.Paths; |
| import java.nio.file.StandardOpenOption; |
| import java.util.concurrent.TimeUnit; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import com.sun.jna.LastErrorException; |
| import com.sun.jna.Native; |
| import com.sun.jna.Pointer; |
| |
| public final class CLibrary |
| { |
| private static final Logger logger = LoggerFactory.getLogger(CLibrary.class); |
| |
| private static final int MCL_CURRENT; |
| private static final int MCL_FUTURE; |
| |
| private static final int ENOMEM = 12; |
| |
| private static final int F_GETFL = 3; /* get file status flags */ |
| private static final int F_SETFL = 4; /* set file status flags */ |
| private static final int F_NOCACHE = 48; /* Mac OS X specific flag, turns cache on/off */ |
| private static final int O_DIRECT = 040000; /* fcntl.h */ |
| private static final int O_RDONLY = 00000000; /* fcntl.h */ |
| |
| private static final int POSIX_FADV_NORMAL = 0; /* fadvise.h */ |
| private static final int POSIX_FADV_RANDOM = 1; /* fadvise.h */ |
| private static final int POSIX_FADV_SEQUENTIAL = 2; /* fadvise.h */ |
| private static final int POSIX_FADV_WILLNEED = 3; /* fadvise.h */ |
| private static final int POSIX_FADV_DONTNEED = 4; /* fadvise.h */ |
| private static final int POSIX_FADV_NOREUSE = 5; /* fadvise.h */ |
| |
| static boolean jnaAvailable = true; |
| static boolean jnaLockable = false; |
| |
| static |
| { |
| try |
| { |
| Native.register("c"); |
| } |
| catch (NoClassDefFoundError e) |
| { |
| logger.warn("JNA not found. Native methods will be disabled."); |
| jnaAvailable = false; |
| } |
| catch (UnsatisfiedLinkError e) |
| { |
| logger.warn("JNA link failure, one or more native method will be unavailable."); |
| logger.trace("JNA link failure details: {}", e.getMessage()); |
| } |
| catch (NoSuchMethodError e) |
| { |
| logger.warn("Obsolete version of JNA present; unable to register C library. Upgrade to JNA 3.2.7 or later"); |
| jnaAvailable = false; |
| } |
| |
| if (System.getProperty("os.arch").toLowerCase().contains("ppc")) |
| { |
| if (System.getProperty("os.name").toLowerCase().contains("linux")) |
| { |
| MCL_CURRENT = 0x2000; |
| MCL_FUTURE = 0x4000; |
| } |
| else if (System.getProperty("os.name").toLowerCase().contains("aix")) |
| { |
| MCL_CURRENT = 0x100; |
| MCL_FUTURE = 0x200; |
| } |
| else |
| { |
| MCL_CURRENT = 1; |
| MCL_FUTURE = 2; |
| } |
| } |
| else |
| { |
| MCL_CURRENT = 1; |
| MCL_FUTURE = 2; |
| } |
| } |
| |
| private static native int mlockall(int flags) throws LastErrorException; |
| private static native int munlockall() throws LastErrorException; |
| private static native int fcntl(int fd, int command, long flags) throws LastErrorException; |
| private static native int posix_fadvise(int fd, long offset, int len, int flag) throws LastErrorException; |
| private static native int open(String path, int flags) throws LastErrorException; |
| private static native int fsync(int fd) throws LastErrorException; |
| private static native int close(int fd) throws LastErrorException; |
| private static native Pointer strerror(int errnum) throws LastErrorException; |
| |
| private static int errno(RuntimeException e) |
| { |
| assert e instanceof LastErrorException; |
| try |
| { |
| return ((LastErrorException) e).getErrorCode(); |
| } |
| catch (NoSuchMethodError x) |
| { |
| logger.warn("Obsolete version of JNA present; unable to read errno. Upgrade to JNA 3.2.7 or later"); |
| return 0; |
| } |
| } |
| |
| private CLibrary() {} |
| |
| public static boolean jnaAvailable() |
| { |
| return jnaAvailable; |
| } |
| |
| public static boolean jnaMemoryLockable() |
| { |
| return jnaLockable; |
| } |
| |
| public static void tryMlockall() |
| { |
| try |
| { |
| mlockall(MCL_CURRENT); |
| jnaLockable = true; |
| logger.info("JNA mlockall successful"); |
| } |
| catch (UnsatisfiedLinkError e) |
| { |
| // this will have already been logged by CLibrary, no need to repeat it |
| } |
| catch (RuntimeException e) |
| { |
| if (!(e instanceof LastErrorException)) |
| throw e; |
| |
| if (errno(e) == ENOMEM && System.getProperty("os.name").toLowerCase().contains("linux")) |
| { |
| logger.warn("Unable to lock JVM memory (ENOMEM)." |
| + " This can result in part of the JVM being swapped out, especially with mmapped I/O enabled." |
| + " Increase RLIMIT_MEMLOCK or run Cassandra as root."); |
| } |
| else if (!System.getProperty("os.name").toLowerCase().contains("mac")) |
| { |
| // OS X allows mlockall to be called, but always returns an error |
| logger.warn("Unknown mlockall error {}", errno(e)); |
| } |
| } |
| } |
| |
| public static void trySkipCache(String path, long offset, long len) |
| { |
| File f = new File(path); |
| if (!f.exists()) |
| return; |
| |
| try (FileInputStream fis = new FileInputStream(f)) |
| { |
| trySkipCache(getfd(fis.getChannel()), offset, len, path); |
| } |
| catch (IOException e) |
| { |
| logger.warn("Could not skip cache", e); |
| } |
| } |
| |
| public static void trySkipCache(int fd, long offset, long len, String path) |
| { |
| if (len == 0) |
| trySkipCache(fd, 0, 0, path); |
| |
| while (len > 0) |
| { |
| int sublen = (int) Math.min(Integer.MAX_VALUE, len); |
| trySkipCache(fd, offset, sublen, path); |
| len -= sublen; |
| offset -= sublen; |
| } |
| } |
| |
| public static void trySkipCache(int fd, long offset, int len, String path) |
| { |
| if (fd < 0) |
| return; |
| |
| try |
| { |
| if (System.getProperty("os.name").toLowerCase().contains("linux")) |
| { |
| int result = posix_fadvise(fd, offset, len, POSIX_FADV_DONTNEED); |
| if (result != 0) |
| NoSpamLogger.log( |
| logger, |
| NoSpamLogger.Level.WARN, |
| 10, |
| TimeUnit.MINUTES, |
| "Failed trySkipCache on file: {} Error: " + strerror(result).getString(0), |
| path); |
| } |
| } |
| catch (UnsatisfiedLinkError e) |
| { |
| // if JNA is unavailable just skipping Direct I/O |
| // instance of this class will act like normal RandomAccessFile |
| } |
| catch (RuntimeException e) |
| { |
| if (!(e instanceof LastErrorException)) |
| throw e; |
| |
| logger.warn(String.format("posix_fadvise(%d, %d) failed, errno (%d).", fd, offset, errno(e))); |
| } |
| } |
| |
| public static int tryFcntl(int fd, int command, int flags) |
| { |
| // fcntl return value may or may not be useful, depending on the command |
| int result = -1; |
| |
| try |
| { |
| result = fcntl(fd, command, flags); |
| } |
| catch (UnsatisfiedLinkError e) |
| { |
| // if JNA is unavailable just skipping |
| } |
| catch (RuntimeException e) |
| { |
| if (!(e instanceof LastErrorException)) |
| throw e; |
| |
| logger.warn(String.format("fcntl(%d, %d, %d) failed, errno (%d).", fd, command, flags, errno(e))); |
| } |
| |
| return result; |
| } |
| |
| public static int tryOpenDirectory(String path) |
| { |
| int fd = -1; |
| |
| try |
| { |
| return open(path, O_RDONLY); |
| } |
| catch (UnsatisfiedLinkError e) |
| { |
| // JNA is unavailable just skipping Direct I/O |
| } |
| catch (RuntimeException e) |
| { |
| if (!(e instanceof LastErrorException)) |
| throw e; |
| |
| logger.warn(String.format("open(%s, O_RDONLY) failed, errno (%d).", path, errno(e))); |
| } |
| |
| return fd; |
| } |
| |
| public static void trySync(int fd) |
| { |
| if (fd == -1) |
| return; |
| |
| try |
| { |
| fsync(fd); |
| } |
| catch (UnsatisfiedLinkError e) |
| { |
| // JNA is unavailable just skipping Direct I/O |
| } |
| catch (RuntimeException e) |
| { |
| if (!(e instanceof LastErrorException)) |
| throw e; |
| |
| logger.warn(String.format("fsync(%d) failed, errno (%d) {}", fd, errno(e)), e); |
| } |
| } |
| |
| public static void tryCloseFD(int fd) |
| { |
| if (fd == -1) |
| return; |
| |
| try |
| { |
| close(fd); |
| } |
| catch (UnsatisfiedLinkError e) |
| { |
| // JNA is unavailable just skipping Direct I/O |
| } |
| catch (RuntimeException e) |
| { |
| if (!(e instanceof LastErrorException)) |
| throw e; |
| |
| logger.warn(String.format("close(%d) failed, errno (%d).", fd, errno(e))); |
| } |
| } |
| |
| public static int getfd(FileChannel channel) |
| { |
| Field field = FBUtilities.getProtectedField(channel.getClass(), "fd"); |
| |
| try |
| { |
| return getfd((FileDescriptor)field.get(channel)); |
| } |
| catch (IllegalArgumentException|IllegalAccessException e) |
| { |
| logger.warn("Unable to read fd field from FileChannel"); |
| } |
| return -1; |
| } |
| |
| /** |
| * Get system file descriptor from FileDescriptor object. |
| * @param descriptor - FileDescriptor objec to get fd from |
| * @return file descriptor, -1 or error |
| */ |
| public static int getfd(FileDescriptor descriptor) |
| { |
| Field field = FBUtilities.getProtectedField(descriptor.getClass(), "fd"); |
| |
| try |
| { |
| return field.getInt(descriptor); |
| } |
| catch (Exception e) |
| { |
| JVMStabilityInspector.inspectThrowable(e); |
| logger.warn("Unable to read fd field from FileDescriptor"); |
| } |
| |
| return -1; |
| } |
| } |