FUSE_DIO_WRITE
FUSE_DIO_WRITE | FUSE_DIO_CUSE);
ret = fuse_direct_io(&io, from, &iocb->ki_pos, FUSE_DIO_WRITE);
int write = flags & FUSE_DIO_WRITE;
FUSE_DIO_WRITE);
ret = fuse_direct_io(io, iter, &pos, FUSE_DIO_WRITE);