While working on moving the code to mm-virtio, I realize this part looks wrong:

https://gitlab.com/virtio-fs/virtiofsd-rs/-/blob/main/src/descriptor_utils.rs#L158

```rust
                self.buffers
                    
.push_back(front.offset(rem).map_err(Error::VolatileMemoryError)?);
                
other.push_front(front.offset(rem).map_err(Error::VolatileMemoryError)?);
```

The "other" end correctly receives the end of the buffer (at offset rem). But 
self should be truncated instead.
---
https://gitlab.com/virtio-fs/virtiofsd-rs/-/issues/6

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