From patchwork Thu May 12 00:49:23 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Blake X-Patchwork-Id: 12846766 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org 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 smtp.lore.kernel.org (Postfix) with ESMTPS id F1E31C433EF for ; Thu, 12 May 2022 00:52:00 +0000 (UTC) Received: from localhost ([::1]:38730 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1nox3f-0007Sv-R2 for qemu-devel@archiver.kernel.org; Wed, 11 May 2022 20:51:59 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:47004) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nox1N-0005Kg-BO for qemu-devel@nongnu.org; Wed, 11 May 2022 20:49:37 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]:29076) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nox1K-0006rq-NH for qemu-devel@nongnu.org; Wed, 11 May 2022 20:49:37 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1652316574; 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=1c7B+cLf0ngBG8GErfdIcUmivlFcPdZ4CK8YgkwdHxw=; b=gAqhz5FdgYyZdCZfDdAS4aABEaiWi1JNRi3lDStS/t8+850+TQZYqR+wV2yX5e051o6AsT hSLolaxCWK/fVVDRlqgEv6mSsaM9ogqr+We1qFZIXzF6R1ksw/H/TOmSHsos+5MQwWcXCA YLQynurL46nuSjCwhOU8cUmdW8dU+30= 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-441-nWS4HRSFNe-gB9eDUTLBJA-1; Wed, 11 May 2022 20:49:29 -0400 X-MC-Unique: nWS4HRSFNe-gB9eDUTLBJA-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.rdu2.redhat.com [10.11.54.3]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id EFE3085A5BE; Thu, 12 May 2022 00:49:27 +0000 (UTC) Received: from blue.redhat.com (unknown [10.22.32.94]) by smtp.corp.redhat.com (Postfix) with ESMTP id 73E731121314; Thu, 12 May 2022 00:49:27 +0000 (UTC) From: Eric Blake To: qemu-devel@nongnu.org Cc: v.sementsov-og@mail.ru, kwolf@redhat.com, qemu-block@nongnu.org, Hanna Reitz Subject: [PATCH v4 1/2] qemu-nbd: Pass max connections to blockdev layer Date: Wed, 11 May 2022 19:49:23 -0500 Message-Id: <20220512004924.417153-2-eblake@redhat.com> In-Reply-To: <20220512004924.417153-1-eblake@redhat.com> References: <20220512004924.417153-1-eblake@redhat.com> MIME-Version: 1.0 Content-type: text/plain X-Scanned-By: MIMEDefang 2.78 on 10.11.54.3 Received-SPF: pass client-ip=170.10.129.124; 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=unavailable 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: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.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 a98eb665da..c5a29ce1c6 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 7f6531cba0..711e0e72bd 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 2382b5042a..0cd5aa6f02 100644 --- a/qemu-nbd.c +++ b/qemu-nbd.c @@ -1095,7 +1095,7 @@ 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) { From patchwork Thu May 12 00:49:24 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Blake X-Patchwork-Id: 12846767 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 1B542C433F5 for ; Thu, 12 May 2022 00:53:09 +0000 (UTC) Received: from localhost ([::1]:42316 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1nox4l-0001Sp-Ur for qemu-devel@archiver.kernel.org; Wed, 11 May 2022 20:53:07 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:47014) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nox1O-0005Ng-Jm for qemu-devel@nongnu.org; Wed, 11 May 2022 20:49:38 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]:21409) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nox1M-0006rx-7v for qemu-devel@nongnu.org; Wed, 11 May 2022 20:49:38 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1652316575; 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=vZqWWeVRNJTElQ92go9w+Hqv9csWsr+KUTPad940POw=; b=Tcff33/w4nY580S1H5ZhTBoiB+1aIc/G/m3WKvEWKf4UoEl9cMBClK3HB/6Ao6EuwMmPPl pg+Ib398v1WqoGNPAcYD4dPKK2lm/1oZ989EssrF99IEz4UiZbluZUYz5NfxzeYp8M5pWu DFzyWz5y7a59LUHFA86/G3kH2hjl4zQ= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-369-nax-5wErPR-2vrRBmZAmYw-1; Wed, 11 May 2022 20:49:31 -0400 X-MC-Unique: nax-5wErPR-2vrRBmZAmYw-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.rdu2.redhat.com [10.11.54.3]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 687A03C1E33B; Thu, 12 May 2022 00:49:31 +0000 (UTC) Received: from blue.redhat.com (unknown [10.22.32.94]) by smtp.corp.redhat.com (Postfix) with ESMTP id 4285D112131E; Thu, 12 May 2022 00:49:28 +0000 (UTC) From: Eric Blake To: qemu-devel@nongnu.org Cc: v.sementsov-og@mail.ru, kwolf@redhat.com, qemu-block@nongnu.org, Nir Soffer , Hanna Reitz , Markus Armbruster Subject: [PATCH v4 2/2] nbd/server: Allow MULTI_CONN for shared writable exports Date: Wed, 11 May 2022 19:49:24 -0500 Message-Id: <20220512004924.417153-3-eblake@redhat.com> In-Reply-To: <20220512004924.417153-1-eblake@redhat.com> References: <20220512004924.417153-1-eblake@redhat.com> MIME-Version: 1.0 Content-type: text/plain X-Scanned-By: MIMEDefang 2.78 on 10.11.54.3 Received-SPF: pass client-ip=170.10.129.124; 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=unavailable 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: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" According to the NBD spec, a server that advertises NBD_FLAG_CAN_MULTI_CONN promises that multiple client connections will not see any cache inconsistencies: when properly separated by a single flush, actions performed by one client will be visible to another client, regardless of which client did the flush. We always satisfy these conditions in qemu - even when we support multiple clients, ALL clients go through a single point of reference into the block layer, with no local caching. The effect of one client is instantly visible to the next client. Even if our backend were a network device, we argue that any multi-path caching effects that would cause inconsistencies in back-to-back actions not seeing the effect of previous actions would be a bug in that backend, and not the fault of caching in qemu. As such, it is safe to unconditionally advertise CAN_MULTI_CONN for any qemu NBD server situation that supports parallel clients. Note, however, that we don't want to advertise CAN_MULTI_CONN when we know that a second client cannot connect (for historical reasons, qemu-nbd defaults to a single connection while nbd-server-add and QMP commands default to unlimited connections; but we already have existing means to let either style of NBD server creation alter those defaults). This is visible by no longer advertising MULTI_CONN for 'qemu-nbd -r' without -e, as in the iotest nbd-qemu-allocation. The harder part of this patch is setting up an iotest to demonstrate behavior of multiple NBD clients to a single server. It might be possible with parallel qemu-io processes, but I found it easier to do in python with the help of libnbd, and help from Nir and Vladimir in writing the test. Signed-off-by: Eric Blake Suggested-by: Nir Soffer Suggested-by: Vladimir Sementsov-Ogievskiy --- docs/interop/nbd.txt | 1 + docs/tools/qemu-nbd.rst | 3 +- qapi/block-export.json | 8 +- include/block/nbd.h | 3 +- blockdev-nbd.c | 5 + nbd/server.c | 10 +- MAINTAINERS | 1 + tests/qemu-iotests/tests/nbd-multiconn | 145 ++++++++++++++++++ tests/qemu-iotests/tests/nbd-multiconn.out | 5 + .../tests/nbd-qemu-allocation.out | 2 +- 10 files changed, 172 insertions(+), 11 deletions(-) create mode 100755 tests/qemu-iotests/tests/nbd-multiconn create mode 100644 tests/qemu-iotests/tests/nbd-multiconn.out diff --git a/docs/interop/nbd.txt b/docs/interop/nbd.txt index bdb0f2a41a..f5ca25174a 100644 --- a/docs/interop/nbd.txt +++ b/docs/interop/nbd.txt @@ -68,3 +68,4 @@ NBD_CMD_BLOCK_STATUS for "qemu:dirty-bitmap:", NBD_CMD_CACHE * 4.2: NBD_FLAG_CAN_MULTI_CONN for shareable read-only exports, NBD_CMD_FLAG_FAST_ZERO * 5.2: NBD_CMD_BLOCK_STATUS for "qemu:allocation-depth" +* 7.1: NBD_FLAG_CAN_MULTI_CONN for shareable writable exports diff --git a/docs/tools/qemu-nbd.rst b/docs/tools/qemu-nbd.rst index 4c950f6199..8e08a29e89 100644 --- a/docs/tools/qemu-nbd.rst +++ b/docs/tools/qemu-nbd.rst @@ -139,8 +139,7 @@ driver options if :option:`--image-opts` is specified. .. option:: -e, --shared=NUM Allow up to *NUM* clients to share the device (default - ``1``), 0 for unlimited. Safe for readers, but for now, - consistency is not guaranteed between multiple writers. + ``1``), 0 for unlimited. .. option:: -t, --persistent diff --git a/qapi/block-export.json b/qapi/block-export.json index 1de16d2589..7776248435 100644 --- a/qapi/block-export.json +++ b/qapi/block-export.json @@ -22,7 +22,9 @@ # recreated on the fly while the NBD server is active. # If missing, it will default to denying access (since 4.0). # @max-connections: The maximum number of connections to allow at the same -# time, 0 for unlimited. (since 5.2; default: 0) +# time, 0 for unlimited. Setting this to 1 also stops +# the server from advertising multiple client support +# (since 5.2; default: 0) # # Since: 4.2 ## @@ -51,7 +53,9 @@ # recreated on the fly while the NBD server is active. # If missing, it will default to denying access (since 4.0). # @max-connections: The maximum number of connections to allow at the same -# time, 0 for unlimited. (since 5.2; default: 0) +# time, 0 for unlimited. Setting this to 1 also stops +# the server from advertising multiple client support +# (since 5.2; default: 0). # # Returns: error if the server is already running. # diff --git a/include/block/nbd.h b/include/block/nbd.h index c5a29ce1c6..c74b7a9d2e 100644 --- a/include/block/nbd.h +++ b/include/block/nbd.h @@ -1,5 +1,5 @@ /* - * Copyright (C) 2016-2020 Red Hat, Inc. + * Copyright (C) 2016-2022 Red Hat, Inc. * Copyright (C) 2005 Anthony Liguori * * Network Block Device @@ -346,6 +346,7 @@ void nbd_client_put(NBDClient *client); void nbd_server_is_qemu_nbd(int max_connections); bool nbd_server_is_running(void); +int nbd_server_max_connections(void); void nbd_server_start(SocketAddress *addr, const char *tls_creds, const char *tls_authz, uint32_t max_connections, Error **errp); diff --git a/blockdev-nbd.c b/blockdev-nbd.c index 711e0e72bd..012256bb02 100644 --- a/blockdev-nbd.c +++ b/blockdev-nbd.c @@ -44,6 +44,11 @@ bool nbd_server_is_running(void) return nbd_server || qemu_nbd_connections >= 0; } +int nbd_server_max_connections(void) +{ + return nbd_server ? nbd_server->max_connections : qemu_nbd_connections; +} + static void nbd_blockdev_client_closed(NBDClient *client, bool ignored) { nbd_client_put(client); diff --git a/nbd/server.c b/nbd/server.c index 4cdbc062c1..213e00e761 100644 --- a/nbd/server.c +++ b/nbd/server.c @@ -1,5 +1,5 @@ /* - * Copyright (C) 2016-2021 Red Hat, Inc. + * Copyright (C) 2016-2022 Red Hat, Inc. * Copyright (C) 2005 Anthony Liguori * * Network Block Device Server Side @@ -1642,7 +1642,6 @@ static int nbd_export_create(BlockExport *blk_exp, BlockExportOptions *exp_args, int64_t size; uint64_t perm, shared_perm; bool readonly = !exp_args->writable; - bool shared = !exp_args->writable; BlockDirtyBitmapOrStrList *bitmaps; size_t i; int ret; @@ -1693,11 +1692,12 @@ static int nbd_export_create(BlockExport *blk_exp, BlockExportOptions *exp_args, exp->description = g_strdup(arg->description); exp->nbdflags = (NBD_FLAG_HAS_FLAGS | NBD_FLAG_SEND_FLUSH | NBD_FLAG_SEND_FUA | NBD_FLAG_SEND_CACHE); + + if (nbd_server_max_connections() != 1) { + exp->nbdflags |= NBD_FLAG_CAN_MULTI_CONN; + } if (readonly) { exp->nbdflags |= NBD_FLAG_READ_ONLY; - if (shared) { - exp->nbdflags |= NBD_FLAG_CAN_MULTI_CONN; - } } else { exp->nbdflags |= (NBD_FLAG_SEND_TRIM | NBD_FLAG_SEND_WRITE_ZEROES | NBD_FLAG_SEND_FAST_ZERO); diff --git a/MAINTAINERS b/MAINTAINERS index 571556d279..fbc0662627 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -3367,6 +3367,7 @@ F: qemu-nbd.* F: blockdev-nbd.c F: docs/interop/nbd.txt F: docs/tools/qemu-nbd.rst +F: tests/qemu-iotests/tests/*nbd* T: git https://repo.or.cz/qemu/ericb.git nbd T: git https://src.openvz.org/scm/~vsementsov/qemu.git nbd diff --git a/tests/qemu-iotests/tests/nbd-multiconn b/tests/qemu-iotests/tests/nbd-multiconn new file mode 100755 index 0000000000..b121f2e363 --- /dev/null +++ b/tests/qemu-iotests/tests/nbd-multiconn @@ -0,0 +1,145 @@ +#!/usr/bin/env python3 +# group: rw auto quick +# +# Test cases for NBD multi-conn advertisement +# +# Copyright (C) 2022 Red Hat, Inc. +# +# This program is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 2 of the License, or +# (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program. If not, see . + +import os +from contextlib import contextmanager +import iotests +from iotests import qemu_img_create, qemu_io + + +disk = os.path.join(iotests.test_dir, 'disk') +size = '4M' +nbd_sock = os.path.join(iotests.sock_dir, 'nbd_sock') +nbd_uri = 'nbd+unix:///{}?socket=' + nbd_sock + + +@contextmanager +def open_nbd(export_name): + h = nbd.NBD() + try: + h.connect_uri(nbd_uri.format(export_name)) + yield h + finally: + h.shutdown() + +class TestNbdMulticonn(iotests.QMPTestCase): + def setUp(self): + qemu_img_create('-f', iotests.imgfmt, disk, size) + qemu_io('-c', 'w -P 1 0 2M', '-c', 'w -P 2 2M 2M', disk) + + self.vm = iotests.VM() + self.vm.launch() + result = self.vm.qmp('blockdev-add', { + 'driver': 'qcow2', + 'node-name': 'n', + 'file': {'driver': 'file', 'filename': disk} + }) + self.assert_qmp(result, 'return', {}) + + def tearDown(self): + self.vm.shutdown() + os.remove(disk) + try: + os.remove(nbd_sock) + except OSError: + pass + + @contextmanager + def run_server(self, max_connections=None): + args = { + 'addr': { + 'type': 'unix', + 'data': {'path': nbd_sock} + } + } + if max_connections is not None: + args['max-connections'] = max_connections + + result = self.vm.qmp('nbd-server-start', args) + self.assert_qmp(result, 'return', {}) + yield + + result = self.vm.qmp('nbd-server-stop') + self.assert_qmp(result, 'return', {}) + + def add_export(self, name, writable=None): + args = { + 'type': 'nbd', + 'id': name, + 'node-name': 'n', + 'name': name, + } + if writable is not None: + args['writable'] = writable + + result = self.vm.qmp('block-export-add', args) + self.assert_qmp(result, 'return', {}) + + def test_default_settings(self): + with self.run_server(): + self.add_export('r') + self.add_export('w', writable=True) + with open_nbd('r') as h: + self.assertTrue(h.can_multi_conn()) + with open_nbd('w') as h: + self.assertTrue(h.can_multi_conn()) + + def test_limited_connections(self): + with self.run_server(max_connections=1): + self.add_export('r') + self.add_export('w', writable=True) + with open_nbd('r') as h: + self.assertFalse(h.can_multi_conn()) + with open_nbd('w') as h: + self.assertFalse(h.can_multi_conn()) + + def test_parallel_writes(self): + with self.run_server(): + self.add_export('w', writable=True) + + clients = [nbd.NBD() for _ in range(3)] + for c in clients: + c.connect_uri(nbd_uri.format('w')) + self.assertTrue(c.can_multi_conn()) + + initial_data = clients[0].pread(1024 * 1024, 0) + self.assertEqual(initial_data, b'\x01' * 1024 * 1024) + + updated_data = b'\x03' * 1024 * 1024 + clients[1].pwrite(updated_data, 0) + clients[2].flush() + current_data = clients[0].pread(1024 * 1024, 0) + + self.assertEqual(updated_data, current_data) + + for i in range(3): + clients[i].shutdown() + + +if __name__ == '__main__': + try: + # Easier to use libnbd than to try and set up parallel + # 'qemu-nbd --list' or 'qemu-io' processes, but not all systems + # have libnbd installed. + import nbd # type: ignore + + iotests.main(supported_fmts=['qcow2']) + except ImportError: + iotests.notrun('libnbd not installed') diff --git a/tests/qemu-iotests/tests/nbd-multiconn.out b/tests/qemu-iotests/tests/nbd-multiconn.out new file mode 100644 index 0000000000..8d7e996700 --- /dev/null +++ b/tests/qemu-iotests/tests/nbd-multiconn.out @@ -0,0 +1,5 @@ +... +---------------------------------------------------------------------- +Ran 3 tests + +OK diff --git a/tests/qemu-iotests/tests/nbd-qemu-allocation.out b/tests/qemu-iotests/tests/nbd-qemu-allocation.out index 0bf1abb063..9d938db24e 100644 --- a/tests/qemu-iotests/tests/nbd-qemu-allocation.out +++ b/tests/qemu-iotests/tests/nbd-qemu-allocation.out @@ -17,7 +17,7 @@ wrote 2097152/2097152 bytes at offset 1048576 exports available: 1 export: '' size: 4194304 - flags: 0x58f ( readonly flush fua df multi cache ) + flags: 0x48f ( readonly flush fua df cache ) min block: 1 opt block: 4096 max block: 33554432