# Re: \[fuse-devel\] \[PATCH v5\] fuse: Add support for passthrough read/write

- From: Andrew Karpow \<hidden\>
- Date: 2016-03-04 12:23:48 
- List: linux-api
- Page: https://ratatoskr.run/linux-api/2016/03/106177
- Thread: https://ratatoskr.run/linux-api/2016/02/104309/t.md

```text
Hi!

Thanks for the passthrough patch, exactly what I was searching for.
I'am currently trying to port your code to a prehistoric RedHat 6 Kernel, but I wonder about some implementation details...
 
> +++ b/fs/fuse/passthrough.c
...
> +void fuse_setup_passthrough(struct fuse_conn *fc, struct fuse_req *req)
..
> +	daemon_fd = (int)open_out->passthrough_fd;
...

> +++ b/include/uapi/linux/fuse.h
...
> @@ -480,7 +481,7 @@ struct fuse_create_in {
>  struct fuse_open_out {
>  	uint64_t	fh;
>  	uint32_t	open_flags;
> -	uint32_t	padding;
> +	int32_t         passthrough_fd;
>  };
 
I don't get where the passthrough_fd struct member is ever set?

with best regards,

Andy
```