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/*
From http://hg.openjdk.java.net/jdk8/jdk8/jdk/file/687fd7c7986d/src/share/native/java/io/RandomAccessFile.c#l83
*/
Java_java_io_RandomAccessFile_writeBytes(JNIEnv *env,
    jobject this, jbyteArray bytes, jint off, jint len) {
    writeBytes(env, this, bytes, off, len, JNI_FALSE, raf_fd);
}

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/*
From http://hg.openjdk.java.net/jdk8/jdk8/jdk/file/687fd7c7986d/src/share/native/java/io/io_util.c#l145
*/
void
writeBytes(JNIEnv *env, jobject this, jbyteArray bytes,
           jint off, jint len, jboolean append, jfieldID fid)
{
    jint n;
    char stackBuf[BUF_SIZE];
    char *buf = NULL;

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/*
From http://hg.openjdk.java.net/jdk8/jdk8/jdk/file/687fd7c7986d/src/solaris/native/java/io/io_util_md.h#l71
*/
#define IO_Write handleWrite
#define IO_Append handleWrite

// ...

/*
http://hg.openjdk.java.net/jdk8/jdk8/jdk/file/687fd7c7986d/src/solaris/native/java/io/io_util_md.c#l160

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/*
From http://hg.openjdk.java.net/jdk8/jdk8/jdk/file/687fd7c7986d/src/solaris/native/sun/nio/ch/FileDispatcherImpl.c#l111
*/
Java_sun_nio_ch_FileDispatcherImpl_pwrite0(JNIEnv *env, jclass clazz, jobject fdo,
                            jlong address, jint len, jlong offset)
{
    jint fd = fdval(env, fdo);
    void *buf = (void *)jlong_to_ptr(address);

    return convertReturnVal(env, pwrite64(fd, buf, len, offset), JNI_FALSE);

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/*
From http://hg.openjdk.java.net/jdk8/jdk8/jdk/file/687fd7c7986d/src/share/classes/java/nio/channels/FileChannel.java#l778
*/
public abstract int write(ByteBuffer src, long position) throws IOException;

// ...

/*
http://hg.openjdk.java.net/jdk8/jdk8/jdk/file/687fd7c7986d/src/share/classes/sun/nio/ch/FileChannelImpl.java#l703
*/

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/*
From http://hg.openjdk.java.net/jdk8/jdk8/jdk/file/687fd7c7986d/src/share/classes/sun/nio/ch/IOUtil.java#l46
*/
static int write(FileDescriptor fd, ByteBuffer src, long position,
                     NativeDispatcher nd)
        throws IOException
{
    if (src instanceof DirectBuffer)
        return writeFromNativeBuffer(fd, src, position, nd);

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/*
From http://hg.openjdk.java.net/jdk8/jdk8/jdk/file/687fd7c7986d/src/solaris/native/sun/nio/ch/FileDispatcherImpl.c#l111
*/
Java_sun_nio_ch_FileDispatcherImpl_pwrite0(JNIEnv *env, jclass clazz, jobject fdo,
                            jlong address, jint len, jlong offset)
{
    jint fd = fdval(env, fdo);
    void *buf = (void *)jlong_to_ptr(address);

    return convertReturnVal(env, pwrite64(fd, buf, len, offset), JNI_FALSE);

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/*
From http://hg.openjdk.java.net/jdk8/jdk8/jdk/file/687fd7c7986d/src/solaris/classes/sun/nio/ch/FileDispatcherImpl.java#l63
*/
int pwrite(FileDescriptor fd, long address, int len, long position)
        throws IOException
{
    return pwrite0(fd, address, len, position);
}

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ssize_t new_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos)
{
       struct iovec iov = { .iov_base = buf, .iov_len = len };
       struct kiocb kiocb;
       struct iov_iter iter;
       ssize_t ret;

       init_sync_kiocb(&kiocb, filp);
       kiocb.ki_pos = *ppos;
       kiocb.ki_nbytes = len;

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xfs_file_read_iter(
       struct kiocb            *iocb,
       struct iov_iter         *to)
{
...
       xfs_rw_ilock(ip, XFS_IOLOCK_SHARED);
...
       ret = generic_file_read_iter(iocb, to);
...
       xfs_rw_iunlock(ip, XFS_IOLOCK_SHARED);