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8164900: Add support for O_DIRECT

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Add support for Direct I/O in FileChannel

Co-authored-by: Volker Simonis <volker.simonis@gmail.com>
Reviewed-by: alanb, bpb, alanbur, coffeys, aph, clanger, plevart, mli, psandoz, simonis
This commit is contained in:
Lucy Lu 2017-10-17 16:51:11 -07:00 • committed by Brian Burkhalter
parent 97db013bd3
commit ec1c3bce45
30 changed files with 1523 additions and 45 deletions
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56
src/java.base/share/classes/sun/nio/ch/FileChannelImpl.java
View file

@ -41,6 +41,11 @@ import java.nio.channels.OverlappingFileLockException;
import java.nio.channels.ReadableByteChannel;
import java.nio.channels.SelectableChannel;
import java.nio.channels.WritableByteChannel;
import java.nio.file.Files;
import java.nio.file.FileStore;
import java.nio.file.FileSystemException;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.List;
@ -87,6 +92,12 @@ public class FileChannelImpl
// Positional-read is not interruptible
private volatile boolean uninterruptible;
// DirectIO flag
private final boolean direct;
// IO alignment value for DirectIO
private final int alignment;
// Cleanable with an action which closes this channel's file descriptor
private final Cleanable closer;
@ -103,14 +114,22 @@ public class FileChannelImpl
}
private FileChannelImpl(FileDescriptor fd, String path, boolean readable,
boolean writable, Object parent)
boolean writable, boolean direct, Object parent)
{
this.fd = fd;
this.readable = readable;
this.writable = writable;
this.parent = parent;
this.path = path;
this.direct = direct;
this.nd = new FileDispatcherImpl();
if (direct) {
assert path != null;
this.alignment = nd.setDirectIO(fd, path);
} else {
this.alignment = -1;
}
// Register a cleaning action if and only if there is no parent
// as the parent will take care of closing the file descriptor.
// FileChannel is used by the LambdaMetaFactory so a lambda cannot
@ -125,7 +144,14 @@ public class FileChannelImpl
boolean readable, boolean writable,
Object parent)
{
return new FileChannelImpl(fd, path, readable, writable, parent);
return new FileChannelImpl(fd, path, readable, writable, false, parent);
}
public static FileChannel open(FileDescriptor fd, String path,
boolean readable, boolean writable,
boolean direct, Object parent)
{
return new FileChannelImpl(fd, path, readable, writable, direct, parent);
}
private void ensureOpen() throws IOException {
@ -181,6 +207,8 @@ public class FileChannelImpl
if (!readable)
throw new NonReadableChannelException();
synchronized (positionLock) {
if (direct)
Util.checkChannelPositionAligned(position(), alignment);
int n = 0;
int ti = -1;
try {
@ -189,7 +217,7 @@ public class FileChannelImpl
if (!isOpen())
return 0;
do {
n = IOUtil.read(fd, dst, -1, nd);
n = IOUtil.read(fd, dst, -1, direct, alignment, nd);
} while ((n == IOStatus.INTERRUPTED) && isOpen());
return IOStatus.normalize(n);
} finally {
@ -209,6 +237,8 @@ public class FileChannelImpl
if (!readable)
throw new NonReadableChannelException();
synchronized (positionLock) {
if (direct)
Util.checkChannelPositionAligned(position(), alignment);
long n = 0;
int ti = -1;
try {
@ -217,7 +247,8 @@ public class FileChannelImpl
if (!isOpen())
return 0;
do {
n = IOUtil.read(fd, dsts, offset, length, nd);
n = IOUtil.read(fd, dsts, offset, length,
direct, alignment, nd);
} while ((n == IOStatus.INTERRUPTED) && isOpen());
return IOStatus.normalize(n);
} finally {
@ -233,6 +264,8 @@ public class FileChannelImpl
if (!writable)
throw new NonWritableChannelException();
synchronized (positionLock) {
if (direct)
Util.checkChannelPositionAligned(position(), alignment);
int n = 0;
int ti = -1;
try {
@ -241,7 +274,7 @@ public class FileChannelImpl
if (!isOpen())
return 0;
do {
n = IOUtil.write(fd, src, -1, nd);
n = IOUtil.write(fd, src, -1, direct, alignment, nd);
} while ((n == IOStatus.INTERRUPTED) && isOpen());
return IOStatus.normalize(n);
} finally {
@ -261,6 +294,8 @@ public class FileChannelImpl
if (!writable)
throw new NonWritableChannelException();
synchronized (positionLock) {
if (direct)
Util.checkChannelPositionAligned(position(), alignment);
long n = 0;
int ti = -1;
try {
@ -269,7 +304,8 @@ public class FileChannelImpl
if (!isOpen())
return 0;
do {
n = IOUtil.write(fd, srcs, offset, length, nd);
n = IOUtil.write(fd, srcs, offset, length,
direct, alignment, nd);
} while ((n == IOStatus.INTERRUPTED) && isOpen());
return IOStatus.normalize(n);
} finally {
@ -752,6 +788,8 @@ public class FileChannelImpl
throw new IllegalArgumentException("Negative position");
if (!readable)
throw new NonReadableChannelException();
if (direct)
Util.checkChannelPositionAligned(position, alignment);
ensureOpen();
if (nd.needsPositionLock()) {
synchronized (positionLock) {
@ -774,7 +812,7 @@ public class FileChannelImpl
if (!isOpen())
return -1;
do {
n = IOUtil.read(fd, dst, position, nd);
n = IOUtil.read(fd, dst, position, direct, alignment, nd);
} while ((n == IOStatus.INTERRUPTED) && isOpen());
return IOStatus.normalize(n);
} finally {
@ -791,6 +829,8 @@ public class FileChannelImpl
throw new IllegalArgumentException("Negative position");
if (!writable)
throw new NonWritableChannelException();
if (direct)
Util.checkChannelPositionAligned(position, alignment);
ensureOpen();
if (nd.needsPositionLock()) {
synchronized (positionLock) {
@ -811,7 +851,7 @@ public class FileChannelImpl
if (!isOpen())
return -1;
do {
n = IOUtil.write(fd, src, position, nd);
n = IOUtil.write(fd, src, position, direct, alignment, nd);
} while ((n == IOStatus.INTERRUPTED) && isOpen());
return IOStatus.normalize(n);
} finally {