From nobody Mon Nov 10 10:04:45 2025 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=virtuozzo.com ARC-Seal: i=1; a=rsa-sha256; t=1555003940; cv=none; d=zoho.com; s=zohoarc; b=JGgwM9mfMAsaPBaHengxGkKz77XRiyvclnKkEJ88YDwJx7qe/gDHQbCz3okcu0NT/8cyWJC9jsyI7XWyMLSXnypSOwIavuudbglyIwGLaVJou0z83kYppvhqqYAGSZY36dGURZKKfADM8ILWDPVDVzUaicrGUPpARIDJjtbh8rE= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zoho.com; s=zohoarc; t=1555003940; h=Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:Message-ID:References:Sender:Subject:To:ARC-Authentication-Results; bh=dW9dADMXs+S9pcqZfnZEx9tzcBHgsF6w3o67qUq7yk0=; b=LS4ylDETaRd8bQJvzaiwz4Xfe/AarQXK5OeCBkvorDiG632n3XhtISWN3JORAW4igRfvnxsPxZHUltdpNYFAPI1g+mgtIvkyIR8n4Ru11caCC9WPPY3Z7cMrmZyEon8J+OsiKOt7zo2DAo1a2pw8HslhCGRmr+Kf3RVNamieHXY= ARC-Authentication-Results: i=1; mx.zoho.com; spf=pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail header.from= (p=none dis=none) header.from= Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1555003940428839.413482810743; Thu, 11 Apr 2019 10:32:20 -0700 (PDT) Received: from localhost ([127.0.0.1]:52605 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hEdYe-0008ES-Fh for importer@patchew.org; Thu, 11 Apr 2019 13:32:16 -0400 Received: from eggs.gnu.org ([209.51.188.92]:50420) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hEdTm-0004ZG-Qe for qemu-devel@nongnu.org; Thu, 11 Apr 2019 13:27:16 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hEdTl-0003bH-Kw for qemu-devel@nongnu.org; Thu, 11 Apr 2019 13:27:14 -0400 Received: from relay.sw.ru ([185.231.240.75]:59352) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hEdTl-0003Zx-9f; Thu, 11 Apr 2019 13:27:13 -0400 Received: from [10.28.8.145] (helo=kvm.sw.ru) by relay.sw.ru with esmtp (Exim 4.91) (envelope-from ) id 1hEdTi-00044D-Tp; Thu, 11 Apr 2019 20:27:10 +0300 From: Vladimir Sementsov-Ogievskiy To: qemu-devel@nongnu.org, qemu-block@nongnu.org Date: Thu, 11 Apr 2019 20:27:06 +0300 Message-Id: <20190411172709.205032-5-vsementsov@virtuozzo.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20190411172709.205032-1-vsementsov@virtuozzo.com> References: <20190411172709.205032-1-vsementsov@virtuozzo.com> X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 185.231.240.75 Subject: [Qemu-devel] [PATCH v6 4/7] block/nbd: add cmdline and qapi parameter reconnect-delay X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kwolf@redhat.com, vsementsov@virtuozzo.com, armbru@redhat.com, mreitz@redhat.com, stefanha@redhat.com, den@openvz.org Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Reconnect will be implemented in the following commit, so for now, in semantics below, disconnect itself is a "serious error". Signed-off-by: Vladimir Sementsov-Ogievskiy Reviewed-by: Eric Blake --- qapi/block-core.json | 12 +++++++++++- block/nbd-client.h | 1 + block/nbd-client.c | 1 + block/nbd.c | 16 +++++++++++++++- 4 files changed, 28 insertions(+), 2 deletions(-) diff --git a/qapi/block-core.json b/qapi/block-core.json index 7ccbfff9d0..815258bd89 100644 --- a/qapi/block-core.json +++ b/qapi/block-core.json @@ -3798,13 +3798,23 @@ # traditional "base:allocation" block status (see # NBD_OPT_LIST_META_CONTEXT in the NBD protocol) (since 3= .0) # +# @reconnect-delay: Reconnect delay. On unexpected disconnect, nbd client = tries +# to connect again, until success or serious error. Duri= ng +# first @reconnect-delay seconds of reconnecting loop all +# requests are paused and have a chance to rerun, if +# successful connect occurs during this time. After +# @reconnect-delay seconds all delayed requests are fail= ed +# and all following requests will be failed too (until +# successful reconnect). Default 0 (Since 4.1) +# # Since: 2.9 ## { 'struct': 'BlockdevOptionsNbd', 'data': { 'server': 'SocketAddress', '*export': 'str', '*tls-creds': 'str', - '*x-dirty-bitmap': 'str' } } + '*x-dirty-bitmap': 'str', + '*reconnect-delay': 'uint32' } } =20 ## # @BlockdevOptionsRaw: diff --git a/block/nbd-client.h b/block/nbd-client.h index e45b7b0a14..91a6b32bdd 100644 --- a/block/nbd-client.h +++ b/block/nbd-client.h @@ -52,6 +52,7 @@ int nbd_client_init(BlockDriverState *bs, QCryptoTLSCreds *tlscreds, const char *hostname, const char *x_dirty_bitmap, + uint32_t reconnect_delay, Error **errp); void nbd_client_close(BlockDriverState *bs); =20 diff --git a/block/nbd-client.c b/block/nbd-client.c index 9f5c86eaa3..1359aff162 100644 --- a/block/nbd-client.c +++ b/block/nbd-client.c @@ -1218,6 +1218,7 @@ int nbd_client_init(BlockDriverState *bs, QCryptoTLSCreds *tlscreds, const char *hostname, const char *x_dirty_bitmap, + uint32_t reconnect_delay, Error **errp) { int ret; diff --git a/block/nbd.c b/block/nbd.c index 208be59602..cffb2aee89 100644 --- a/block/nbd.c +++ b/block/nbd.c @@ -360,6 +360,18 @@ static QemuOptsList nbd_runtime_opts =3D { .help =3D "experimental: expose named dirty bitmap in place of= " "block status", }, + { + .name =3D "reconnect-delay", + .type =3D QEMU_OPT_NUMBER, + .help =3D "Reconnect delay. On unexpected disconnect, nbd clie= nt " + "tries to connect again, until success or serious erro= r. " + "During first @reconnect-delay seconds of reconnecting= " + "loop all requests are paused and have a chance to rer= un, " + "if successful connect occurs during this time. After" + "@reconnect-delay seconds all delayed requests are fai= led" + "and all following requests will be failed too (until" + "successful reconnect). Default 0", + }, { /* end of list */ } }, }; @@ -411,7 +423,9 @@ static int nbd_open(BlockDriverState *bs, QDict *option= s, int flags, =20 /* NBD handshake */ ret =3D nbd_client_init(bs, s->saddr, s->export, tlscreds, hostname, - qemu_opt_get(opts, "x-dirty-bitmap"), errp); + qemu_opt_get(opts, "x-dirty-bitmap"), + qemu_opt_get_number(opts, "reconnect-delay", 0), + errp); =20 error: if (tlscreds) { --=20 2.18.0