From patchwork Tue Apr 26 20:15:14 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Blake X-Patchwork-Id: 1622700 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: bilbo.ozlabs.org; dkim=fail reason="signature verification failed" (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=TxFSTN17; dkim-atps=neutral Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) 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 bilbo.ozlabs.org (Postfix) with ESMTPS id 4Kntc73xPWz9s09 for ; Wed, 27 Apr 2022 06:23:03 +1000 (AEST) Received: from localhost ([::1]:34762 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1njRi9-0006JV-KM for incoming@patchwork.ozlabs.org; Tue, 26 Apr 2022 16:23:01 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:43310) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1njRaw-0008N1-Pe for qemu-devel@nongnu.org; Tue, 26 Apr 2022 16:15:40 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:41402) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1njRau-0007ji-Qz for qemu-devel@nongnu.org; Tue, 26 Apr 2022 16:15:34 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1651004131; 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: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=ZWU/MZeJOPgKMmvsL+4XnP300QZintm0wkLWgBBgn2o=; b=TxFSTN17cszgE3ScDFojwf/rf8RMDS7KhsM4zSIXjSzUrL1FzHF5kFt/lMvRGf4gHRB28C /Exmh5FBe2d3Vn/7WD6NvrwGNVYYeV9Pxjj39VB1HZbe/NdjTkL15i/HuDyOZ6QHIF+RxP whDFWJEZvibdANFNaM5R/Ywzlv80FeM= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-464-uImFemzqM2mNs1CutTARDg-1; Tue, 26 Apr 2022 16:15:29 -0400 X-MC-Unique: uImFemzqM2mNs1CutTARDg-1 Received: from smtp.corp.redhat.com (int-mx09.intmail.prod.int.rdu2.redhat.com [10.11.54.9]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 732BC1014A62; Tue, 26 Apr 2022 20:15:29 +0000 (UTC) Received: from blue.redhat.com (unknown [10.2.16.160]) by smtp.corp.redhat.com (Postfix) with ESMTP id F06A15550B2; Tue, 26 Apr 2022 20:15:28 +0000 (UTC) From: Eric Blake To: qemu-devel@nongnu.org Subject: [PULL 13/13] qemu-nbd: Pass max connections to blockdev layer Date: Tue, 26 Apr 2022 15:15:14 -0500 Message-Id: <20220426201514.170410-14-eblake@redhat.com> In-Reply-To: <20220426201514.170410-1-eblake@redhat.com> References: <20220426201514.170410-1-eblake@redhat.com> MIME-Version: 1.0 Content-type: text/plain X-Scanned-By: MIMEDefang 2.85 on 10.11.54.9 Received-SPF: pass client-ip=170.10.133.124; envelope-from=eblake@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -28 X-Spam_score: -2.9 X-Spam_bar: -- X-Spam_report: (-2.9 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.082, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kevin Wolf , Hanna Reitz , Vladimir Sementsov-Ogievskiy , "open list:Block layer core" Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" The next patch wants to adjust whether the NBD server code advertises MULTI_CONN based on whether it is known if the server limits to exactly one client. For a server started by QMP, this information is obtained through nbd_server_start (which can support more than one export); but for qemu-nbd (which supports exactly one export), it is controlled only by the command-line option -e/--shared. Since we already have a hook function used by qemu-nbd, it's easiest to just alter its signature to fit our needs. Signed-off-by: Eric Blake --- include/block/nbd.h | 2 +- blockdev-nbd.c | 8 ++++---- qemu-nbd.c | 2 +- 3 files changed, 6 insertions(+), 6 deletions(-) diff --git a/include/block/nbd.h b/include/block/nbd.h index a98eb665da04..c5a29ce1c61b 100644 --- a/include/block/nbd.h +++ b/include/block/nbd.h @@ -344,7 +344,7 @@ void nbd_client_new(QIOChannelSocket *sioc, void nbd_client_get(NBDClient *client); void nbd_client_put(NBDClient *client); -void nbd_server_is_qemu_nbd(bool value); +void nbd_server_is_qemu_nbd(int max_connections); bool nbd_server_is_running(void); void nbd_server_start(SocketAddress *addr, const char *tls_creds, const char *tls_authz, uint32_t max_connections, diff --git a/blockdev-nbd.c b/blockdev-nbd.c index 7f6531cba00e..711e0e72bdc8 100644 --- a/blockdev-nbd.c +++ b/blockdev-nbd.c @@ -30,18 +30,18 @@ typedef struct NBDServerData { } NBDServerData; static NBDServerData *nbd_server; -static bool is_qemu_nbd; +static int qemu_nbd_connections = -1; /* Non-negative if this is qemu-nbd */ static void nbd_update_server_watch(NBDServerData *s); -void nbd_server_is_qemu_nbd(bool value) +void nbd_server_is_qemu_nbd(int max_connections) { - is_qemu_nbd = value; + qemu_nbd_connections = max_connections; } bool nbd_server_is_running(void) { - return nbd_server || is_qemu_nbd; + return nbd_server || qemu_nbd_connections >= 0; } static void nbd_blockdev_client_closed(NBDClient *client, bool ignored) diff --git a/qemu-nbd.c b/qemu-nbd.c index db63980df1e4..b40368c5bdd3 100644 --- a/qemu-nbd.c +++ b/qemu-nbd.c @@ -1094,7 +1094,7 @@ int main(int argc, char **argv) bs->detect_zeroes = detect_zeroes; - nbd_server_is_qemu_nbd(true); + nbd_server_is_qemu_nbd(shared); export_opts = g_new(BlockExportOptions, 1); *export_opts = (BlockExportOptions) {