linux-kernel - RE: [RFC PATCH 09/09] Introduce cache=rdma moutning option

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Message-ID: <MWHPR2101MB07297B07D495D66A1C9416FACE900@MWHPR2101MB0729.namprd21.prod.outlook.com>
Date:   Fri, 18 May 2018 19:00:39 +0000
From:   Long Li <longli@...rosoft.com>
To:     Christoph Hellwig <hch@...radead.org>
CC:     Steve French <sfrench@...ba.org>,
        "linux-cifs@...r.kernel.org" <linux-cifs@...r.kernel.org>,
        "samba-technical@...ts.samba.org" <samba-technical@...ts.samba.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>
Subject: RE: [RFC PATCH 09/09] Introduce cache=rdma moutning option

> Subject: Re: [RFC PATCH 09/09] Introduce cache=rdma moutning option
> 
> On Thu, May 17, 2018 at 05:22:14PM -0700, Long Li wrote:
> > From: Long Li <longli@...rosoft.com>
> >
> > When cache=rdma is enabled on mount options, CIFS do not allocate
> > internal data buffer pages for I/O, data is read/writen directly to user
> memory via RDMA.
> 
> I don't think this should be an option.  For direct I/O without signing or
> encryption CIFS should always use get_user_pages, with or without RDMA.

Yes this should be done for all transport. If there are no objections, I'll send patches to change this.