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From:   Olga Kornievskaia <olga.kornievskaia@gmail.com>
Date:   Mon, 29 Oct 2018 13:54:37 -0400
Message-ID: <CAN-5tyF14PZztzVyYXXxZMSUEg6DiQpb0cnfUxXZk-qE2ChrpA@mail.gmail.com>
Subject: Re: [PATCH v1 00/13] server-side support for "inter" SSC copy
To:     "J. Bruce Fields" <bfields@fieldses.org>
Cc:     "J. Bruce Fields" <bfields@redhat.com>,
        linux-nfs <linux-nfs@vger.kernel.org>
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On Thu, Oct 25, 2018 at 12:08 PM J. Bruce Fields <bfields@fieldses.org> wrote:
>
> On Fri, Oct 19, 2018 at 11:28:52AM -0400, Olga Kornievskaia wrote:
> > This patch series adds support for NFSv4.2 copy offload feature
> > allowing copy between two different NFS servers.
>
> Apologies, it may take me another week or so to get to this....
>
> This is the part that sounds trickiest!:

I'll look for your comments next week. Please note that client side
patches that NFSD depends on have changed (due to the client side
review) so to run/compile the code, please grab all of the latest
client-side patches that I posted.

I'm assuming that async patches are going into 4.20, correct?

>
> > On the destination server, upon receiving a COPY request, the server
> > establishes the necessary clientid/session with the source server.
> > It calls into the NFS client code to establish the necessary
> > open stateid, filehandle, file description (without doing an NFS open).
> > Then the server calls into the copy_file_range() to preform the copy
> > where the source file will issue NFS READs and then do local file
> > system writes (this depends on the VFS ability to do cross device
> > copy_file_range().
>
> --b.