From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0E416C433DB for ; Wed, 31 Mar 2021 10:09:48 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 752116191D for ; Wed, 31 Mar 2021 10:09:47 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 752116191D Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:38676 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lRXnG-0000Fn-DS for qemu-devel@archiver.kernel.org; Wed, 31 Mar 2021 06:09:46 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:55534) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lRXm8-0008GW-PS for qemu-devel@nongnu.org; Wed, 31 Mar 2021 06:08:37 -0400 Received: from us-smtp-delivery-124.mimecast.com ([63.128.21.124]:58574) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lRXm3-0002YU-KE for qemu-devel@nongnu.org; Wed, 31 Mar 2021 06:08:36 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1617185309; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=ebWK1JW8esfjUCnIk6+QOoGzwdZ4BnYGo8AyZzeCDK4=; b=On2P5/6ZFyLjlApUqs6ziZ4yyBj6RjOB6Qo5qGZWHSIisHs7bqbgJ1siTRE38PgvCOXQ07 DvJtbBcf/XB4X0iaGxixEQUBeRo8f/R0GjoOgYdUt0DgkFnxY2lSVl0zyKAiTPy9ThQHp6 /I7RD1kP07Z2hvPL9fNkNhHfIOPXoq4= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-536-A4lNPHxkNEOxEJseworWWA-1; Wed, 31 Mar 2021 06:08:25 -0400 X-MC-Unique: A4lNPHxkNEOxEJseworWWA-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 269A38189C8 for ; Wed, 31 Mar 2021 10:08:25 +0000 (UTC) Received: from localhost (ovpn-115-85.ams2.redhat.com [10.36.115.85]) by smtp.corp.redhat.com (Postfix) with ESMTP id 667AD1001281; Wed, 31 Mar 2021 10:08:21 +0000 (UTC) Date: Wed, 31 Mar 2021 11:08:20 +0100 From: Stefan Hajnoczi To: Eric Blake Subject: Re: [PATCH] sockets: update SOCKET_ADDRESS_TYPE_FD listen(2) backlog Message-ID: References: <20210310173004.420190-1-stefanha@redhat.com> <2e7bb28d-0b3c-ac69-7984-687d4ee487c7@redhat.com> MIME-Version: 1.0 In-Reply-To: <2e7bb28d-0b3c-ac69-7984-687d4ee487c7@redhat.com> X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=stefanha@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="61jgAfy5TmAuIx3X" Content-Disposition: inline Received-SPF: pass client-ip=63.128.21.124; envelope-from=stefanha@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "Richard W . M . Jones" , Juan Quintela , Daniel Berrange , kraxel@redhat.com, qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" --61jgAfy5TmAuIx3X Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, Mar 16, 2021 at 08:35:14AM -0500, Eric Blake wrote: > On 3/16/21 4:10 AM, Stefan Hajnoczi wrote: > > On Wed, Mar 10, 2021 at 05:30:04PM +0000, Stefan Hajnoczi wrote: > >> socket_get_fd() fails with the error "socket_get_fd: too many > >> connections" if the given listen backlog value is not 1. > >> > >> Not all callers set the backlog to 1. For example, commit > >> 582d4210eb2f2ab5baac328fe4b479cd86da1647 ("qemu-nbd: Use SOMAXCONN for > >> socket listen() backlog") uses SOMAXCONN. This will always fail with i= n > >> socket_get_fd(). > >> > >> This patch calls listen(2) on the fd to update the backlog value. The > >> socket may already be in the listen state. I have tested that this wor= ks > >> on Linux 5.10 and macOS Catalina. > >> > >> As a bonus this allows us to detect when the fd cannot listen. Now we'= ll > >> be able to catch unbound or connected fds in socket_listen(). > >> > >> Drop the num argument from socket_get_fd() since this function is also > >> called by socket_connect() where a listen backlog value does not make > >> sense. > >> > >> Fixes: e5b6353cf25c99c3f08bf51e29933352f7140e8f ("socket: Add backlog = parameter to socket_listen") > >> Reported-by: Richard W.M. Jones > >> Cc: Juan Quintela > >> Cc: Eric Blake > >> Signed-off-by: Stefan Hajnoczi > >> --- > >> util/qemu-sockets.c | 29 ++++++++++++++++++++++------- > >> 1 file changed, 22 insertions(+), 7 deletions(-) > >=20 > > Dan and Gerd: Can this go via one of your trees? > >=20 >=20 > As it showed up as a regression in qemu-nbd, I can also consider queuing > it in my NBD tree. However, I claim it counts as a bug fix, so it is > fine for -rc1 even if it misses soft freeze. >=20 > I'm fine whichever maintainer takes this, although I've now flagged it > to go through an NBD pull request if it doesn't land elsewhere sooner. Hi Eric, Is this patch going into QEMU 6.0? Thanks, Stefan --61jgAfy5TmAuIx3X Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAEBCAAdFiEEhpWov9P5fNqsNXdanKSrs4Grc8gFAmBkShQACgkQnKSrs4Gr c8gDLQf/aF7myGYPuAqZF2JzhcmNDZMqYahhDqqoJQeM0vO19SsHRG+ZR+xcuXSy duoTnSbwEjjKE7V9AKAIo7VziYIScf9G7bMHkwr2EoXYkroyRezmpq791h7OqPev UofkigyhnA4HpcP1qVhobLGaPDagw9p23KnkiOIuZQc0Lw2Pg839sSJA+u8f45NJ i3pyyuLXhAN3YwSDVdp4+okCJNHR+fUkGdGWYAmlMO7AiW6mWy8Mi0WqFKKOMXF/ tcZhTIOU0fuelmXQxuv1muVrW88+NCPcKG4cgTI4Qd/9KF3WMLeuzXwZprRoOuEB s7InO+Vj68/ky5j2/gh/cWlMhPDBig== =jm+N -----END PGP SIGNATURE----- --61jgAfy5TmAuIx3X--