linux-kernel - Re: [PATCH] fuse: reserve byteswapped init opcodes

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Message-ID: <20190904185329.GL26826@stefanha-x1.localdomain>
Date:   Wed, 4 Sep 2019 19:53:29 +0100
From:   Stefan Hajnoczi <stefanha@...hat.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     linux-kernel@...r.kernel.org, Miklos Szeredi <miklos@...redi.hu>,
        linux-fsdevel@...r.kernel.org, dgilbert@...hat.com
Subject: Re: [PATCH] fuse: reserve byteswapped init opcodes

On Wed, Sep 04, 2019 at 08:36:33AM -0400, Michael S. Tsirkin wrote:
> virtio fs tunnels fuse over a virtio channel.  One issue is two sides
> might be speaking different endian-ness. To detects this,
> host side looks at the opcode value in the FUSE_INIT command.
> Works fine at the moment but might fail if a future version
> of fuse will use such an opcode for initialization.
> Let's reserve this opcode so we remember and don't do this.
> 
> Same for CUSE_INIT.
> 
> Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
> ---
>  include/uapi/linux/fuse.h | 4 ++++
>  1 file changed, 4 insertions(+)

Reviewed-by: Stefan Hajnoczi <stefanha@...hat.com>

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