linux-kernel - RE: [PATCH V2 1/1] Drivers: hv: Implement the file copy service

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Message-ID: <2e6db4b0ae7c42e5afc4b3b1aa5f2c7e@BY2PR03MB299.namprd03.prod.outlook.com>
Date:	Thu, 16 Jan 2014 15:52:25 +0000
From:	KY Srinivasan <kys@...rosoft.com>
To:	Olaf Hering <olaf@...fle.de>
CC:	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"apw@...onical.com" <apw@...onical.com>,
	"jasowang@...hat.com" <jasowang@...hat.com>
Subject: RE: [PATCH V2 1/1] Drivers: hv: Implement the file copy service



> -----Original Message-----
> From: Olaf Hering [mailto:olaf@...fle.de]
> Sent: Thursday, January 16, 2014 1:42 AM
> To: KY Srinivasan
> Cc: gregkh@...uxfoundation.org; linux-kernel@...r.kernel.org;
> devel@...uxdriverproject.org; apw@...onical.com; jasowang@...hat.com
> Subject: Re: [PATCH V2 1/1] Drivers: hv: Implement the file copy service
> 
> On Tue, Jan 14, K. Y. Srinivasan wrote:
> 
> > +enum hv_fcopy_op {
> > +	START_FILE_COPY = 0,
> > +	WRITE_TO_FILE,
> > +	COMPLETE_FCOPY,
> > +	CANCEL_FCOPY,
> > +};
> > +
> > +struct hv_fcopy_hdr {
> > +	enum hv_fcopy_op operation;
> > +	uuid_le service_id0; /* currently unused */
> > +	uuid_le service_id1; /* currently unused */
> > +} __attribute__((packed));
> 
> Is enum a fixed size? This struct is used in other structs, so I wonder
> what will happen to the kernel/user protocol if any of that changes. Or
> with a 64bit kernel and 32bit daemon. Maybe operation should be __u32?

I will check and make the necessary changes.

Thank you,

K. Y
> 
> 
> Olaf