message: fuse: increase FUSE_KERN_BUF_SIZE
  fuse-rs replies INIT with max write 1MB and 256 pages. We should honor
  it when preparing fuse request buffer otherwise newer kernel would just
  reject sys_read on /dev/fuse.
diff: @@ -25,7 +25,7 @@ use fuse_rs::transport::{FuseBuf, Reader, Writer};
  use vmm_sys_util::eventfd::EventFd;
  /// These follows definition from libfuse
  -const FUSE_KERN_BUF_SIZE: usize = 32;
  +const FUSE_KERN_BUF_SIZE: usize = 256;
  const FUSE_HEADER_SIZE: usize = 0x1000;
  const FUSE_DEVICE: &str = "/dev/fuse";
  