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

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Message-ID: <20180518072631.GA19250@infradead.org>
Date:   Fri, 18 May 2018 00:26:31 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     longli@...rosoft.com
Cc:     Steve French <sfrench@...ba.org>, linux-cifs@...r.kernel.org,
        samba-technical@...ts.samba.org, linux-kernel@...r.kernel.org,
        linux-rdma@...r.kernel.org
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.