From patchwork Thu Jan 21 16:37:20 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?q?Daniel_P=2E_Berrang=C3=A9?= X-Patchwork-Id: 8083031 Return-Path: X-Original-To: patchwork-qemu-devel@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id A64FB9F440 for ; Thu, 21 Jan 2016 16:39:54 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 0F8CD20390 for ; Thu, 21 Jan 2016 16:39:54 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 594262043C for ; Thu, 21 Jan 2016 16:39:53 +0000 (UTC) Received: from localhost ([::1]:48647 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aMIH2-0008MN-Nc for patchwork-qemu-devel@patchwork.kernel.org; Thu, 21 Jan 2016 11:39:52 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:41500) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aMIF2-0004jL-Qm for qemu-devel@nongnu.org; Thu, 21 Jan 2016 11:37:49 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1aMIF1-0004Cc-QA for qemu-devel@nongnu.org; Thu, 21 Jan 2016 11:37:48 -0500 Received: from mx1.redhat.com ([209.132.183.28]:36780) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aMIEz-0004Am-Cz; Thu, 21 Jan 2016 11:37:45 -0500 Received: from int-mx09.intmail.prod.int.phx2.redhat.com (int-mx09.intmail.prod.int.phx2.redhat.com [10.5.11.22]) by mx1.redhat.com (Postfix) with ESMTPS id 0CE06BBF6F; Thu, 21 Jan 2016 16:37:45 +0000 (UTC) Received: from t530wlan.home.berrange.com.com (vpn1-6-170.ams2.redhat.com [10.36.6.170]) by int-mx09.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u0LGbXn4001020; Thu, 21 Jan 2016 11:37:43 -0500 From: "Daniel P. Berrange" To: qemu-devel@nongnu.org Date: Thu, 21 Jan 2016 16:37:20 +0000 Message-Id: <1453394247-2267-8-git-send-email-berrange@redhat.com> In-Reply-To: <1453394247-2267-1-git-send-email-berrange@redhat.com> References: <1453394247-2267-1-git-send-email-berrange@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.22 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 209.132.183.28 Cc: Paolo Bonzini , qemu-block@nongnu.org Subject: [Qemu-devel] [PATCH v4 07/14] nbd: make client request fixed new style if advertized X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP If the server advertizes support for the fixed new style negotiation, the client should in turn enable new style. This will allow the client to negotiate further NBD options besides the export name. Signed-off-by: Daniel P. Berrange --- nbd/client.c | 27 +++++++++++++++++---------- 1 file changed, 17 insertions(+), 10 deletions(-) diff --git a/nbd/client.c b/nbd/client.c index 65c8a27..22d69ff 100644 --- a/nbd/client.c +++ b/nbd/client.c @@ -75,7 +75,6 @@ int nbd_receive_negotiate(QIOChannel *ioc, const char *name, uint32_t *flags, { char buf[256]; uint64_t magic, s; - uint16_t tmp; int rc; TRACE("Receiving negotiation."); @@ -116,19 +115,26 @@ int nbd_receive_negotiate(QIOChannel *ioc, const char *name, uint32_t *flags, TRACE("Magic is 0x%" PRIx64, magic); if (magic == NBD_OPTS_MAGIC) { - uint32_t reserved = 0; + uint32_t clientflags = 0; uint32_t opt; uint32_t namesize; + uint16_t globalflags; + uint16_t exportflags; - if (read_sync(ioc, &tmp, sizeof(tmp)) != sizeof(tmp)) { + if (read_sync(ioc, &globalflags, sizeof(globalflags)) != + sizeof(globalflags)) { error_setg(errp, "Failed to read server flags"); goto fail; } - *flags = be16_to_cpu(tmp) << 16; - /* reserved for future use */ - if (write_sync(ioc, &reserved, sizeof(reserved)) != - sizeof(reserved)) { - error_setg(errp, "Failed to read reserved field"); + *flags = be16_to_cpu(globalflags) << 16; + if (globalflags & NBD_FLAG_FIXED_NEWSTYLE) { + TRACE("Server supports fixed new style"); + clientflags |= NBD_FLAG_C_FIXED_NEWSTYLE; + } + /* client requested flags */ + if (write_sync(ioc, &clientflags, sizeof(clientflags)) != + sizeof(clientflags)) { + error_setg(errp, "Failed to send clientflags field"); goto fail; } /* write the export name */ @@ -164,11 +170,12 @@ int nbd_receive_negotiate(QIOChannel *ioc, const char *name, uint32_t *flags, *size = be64_to_cpu(s); TRACE("Size is %" PRIu64, *size); - if (read_sync(ioc, &tmp, sizeof(tmp)) != sizeof(tmp)) { + if (read_sync(ioc, &exportflags, sizeof(exportflags)) != + sizeof(exportflags)) { error_setg(errp, "Failed to read export flags"); goto fail; } - *flags |= be16_to_cpu(tmp); + *flags |= be16_to_cpu(exportflags); } else if (magic == NBD_CLIENT_MAGIC) { if (name) { error_setg(errp, "Server does not support export names");