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

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date:	Fri, 04 Mar 2016 13:23:48 +0100
from:	"Andrew Karpow" <andy@...k.de>
to:	"Nikhilesh Reddy" <reddyn@...eaurora.org>
cc:	torvalds@...ux-foundation.org,
	"Miklos Szeredi" <miklos@...redi.hu>,
	"fuse-devel" <fuse-devel@...ts.sourceforge.net>,
	linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
	gregkh@...uxfoundation.org, linux-fsdevel@...r.kernel.org,
	viro@...iv.linux.org.uk, "Richard Weinberger" <richard@....at>,
	"Theodore Tso" <tytso@....edu>, jack@...e.cz,
	"Antonio SJ Musumeci" <trapexit@...wn.link>, sven.utcke@....de,
	"Nikolaus Rath" <nikolaus@...h.org>,
	"Jann Horn" <jannhorn@...glemail.com>,
	"Mike Shal" <marfey@...il.com>
subject: Re: [fuse-devel] [PATCH v5] fuse: Add support for passthrough 
 read/write

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