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t=1706095464; bh=oDmzlcTHt2byiZfpR65DYFMdnWeZlnilvXyDpVzRqlo=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=PZMFjFF3YSuvslHEhD3jFg8ICu1JlEt1c/2RUumxkx9o6RbfUd2tBU23MM3fz+5Sa Nv2ZFenCEMkRwr2vvyOwpVtIHMn5TVy1b5+SQvAOBOTaGi4mAG/9yMJk5SwOcztIDa ZEq0M0h4dRHmI2ltVL84xPwLXXSuMB9g3xx05gkq5W2VaLT5bFjkkkGvMPxsIhHDOC sqAQbOF4gEg24AqGe1R/gGMQou9GQTV6BK7fJ1jJk+0+3tjOHpgbn+Gd7QbY6tvb1H Oe1xIS/QPUE2BYgBnhE77uWoHmCWT6B9lZjxfkQRaxs1NRUz6tupKds8Cg/U6+d+Wf ZHisyLIYy2eVA== Message-ID: <8fabd83caa0d44369853a4040a89c069f9b0f935.camel@kernel.org> Subject: Re: [PATCH v6 3/3] NFSD: add write_ports to netlink command From: Jeff Layton To: Lorenzo Bianconi Cc: Chuck Lever , NeilBrown , linux-nfs@vger.kernel.org, lorenzo.bianconi@redhat.com, kuba@kernel.org, horms@kernel.org, netdev@vger.kernel.org Date: Wed, 24 Jan 2024 06:24:22 -0500 In-Reply-To: References: <9e3ae337dcf168c60c4cfd51aa0b2fc7b24bcbfb.camel@kernel.org> <170595930799.23031.17998490973211605470@noble.neil.brown.name> 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 kZWuOsJdJQdmwlWC5L5ln9xgfr/4mOY38B0U= Content-Type: text/plain; charset="ISO-8859-15" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.50.3 (3.50.3-1.fc39) Precedence: bulk X-Mailing-List: linux-nfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Wed, 2024-01-24 at 10:52 +0100, Lorenzo Bianconi wrote: > [...] > >=20 > > That's a great question. We do need to properly support the -H option t= o > > rpc.nfsd. What we do today is look up the hostname or address using > > getaddrinfo, and then open a listening socket for that address and then > > pass that fd down to the kernel, which I think then takes the socket an= d > > sticks it on sv_permsocks. > >=20 > > All of that seems a bit klunky. Ideally, I'd say the best thing would b= e > > to allow userland to pass the sockaddr we look up directly via netlink, > > and then let the kernel open the socket. That will probably mean > > refactoring some of the svc_xprt_create machinery to take a sockaddr, > > but I don't think it looks too hard to do. >=20 > Do we already have a specific use case for it? I think we can even add it > later when we have a defined use case for it on top of the current series= . >=20 Yes: rpc.nfsd -H makes nfsd listen on a particular address and port. By passing down the sockaddr instead of an already-opened socket descriptor, we can achieve the goal without having to open sockets in userland. --=20 Jeff Layton