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=-6.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,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 3F89CC10DCE for ; Fri, 6 Mar 2020 17:29:33 +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 0B4DC2051A for ; Fri, 6 Mar 2020 17:29:33 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="QPdjLq75" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0B4DC2051A 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]:40008 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jAGmy-0001VK-5x for qemu-devel@archiver.kernel.org; Fri, 06 Mar 2020 12:29:32 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:49037) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jAGZi-0005K8-Qa for qemu-devel@nongnu.org; Fri, 06 Mar 2020 12:15:52 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1jAGZh-0000CR-CK for qemu-devel@nongnu.org; Fri, 06 Mar 2020 12:15:50 -0500 Received: from us-smtp-2.mimecast.com ([205.139.110.61]:31459 helo=us-smtp-delivery-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1jAGZh-00008g-69 for qemu-devel@nongnu.org; Fri, 06 Mar 2020 12:15:49 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1583514947; 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=IPhzgXwYKIPvGU4hituByNTQBmvc9DGERkEjCGZhogo=; b=QPdjLq755UG4bIpwJIGY3Rekwo/fIQLOC7IwEZQmMmb4dkwCZzYI1nZcgvP71szulctBKH kBjWqoRfx5OAF27I1X/zP/3nOUBHZwDkVl3iswrju/UcmnATXCP402TdrUsme5Gy8pyB7X RQJ0LThT2qM/ZweeID3XVnPON5Lqw4E= 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-224-DMfpYStoNJepv9sMrIJ72g-1; Fri, 06 Mar 2020 12:15:44 -0500 X-MC-Unique: DMfpYStoNJepv9sMrIJ72g-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 05844100550D; Fri, 6 Mar 2020 17:15:43 +0000 (UTC) Received: from linux.fritz.box.com (unknown [10.36.118.33]) by smtp.corp.redhat.com (Postfix) with ESMTP id 0E99A73873; Fri, 6 Mar 2020 17:15:41 +0000 (UTC) From: Kevin Wolf To: qemu-block@nongnu.org Subject: [PULL 29/29] block: bdrv_reopen() with backing file in different AioContext Date: Fri, 6 Mar 2020 18:14:58 +0100 Message-Id: <20200306171458.1848-30-kwolf@redhat.com> In-Reply-To: <20200306171458.1848-1-kwolf@redhat.com> References: <20200306171458.1848-1-kwolf@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 205.139.110.61 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: kwolf@redhat.com, peter.maydell@linaro.org, qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" This patch allows bdrv_reopen() (and therefore the x-blockdev-reopen QMP command) to attach a node as the new backing file even if the node is in a different AioContext than the parent if one of both nodes can be moved to the AioContext of the other node. Signed-off-by: Kevin Wolf Tested-by: Peter Krempa Message-Id: <20200306141413.30705-3-kwolf@redhat.com> Reviewed-by: Alberto Garcia Signed-off-by: Kevin Wolf --- block.c | 32 ++++++++++++++++++++++++++------ tests/qemu-iotests/245 | 8 +++----- 2 files changed, 29 insertions(+), 11 deletions(-) diff --git a/block.c b/block.c index aaa387504e..957630b1c5 100644 --- a/block.c +++ b/block.c @@ -3787,6 +3787,29 @@ static void bdrv_reopen_perm(BlockReopenQueue *q, Bl= ockDriverState *bs, *shared =3D cumulative_shared_perms; } =20 +static bool bdrv_reopen_can_attach(BlockDriverState *parent, + BdrvChild *child, + BlockDriverState *new_child, + Error **errp) +{ + AioContext *parent_ctx =3D bdrv_get_aio_context(parent); + AioContext *child_ctx =3D bdrv_get_aio_context(new_child); + GSList *ignore; + bool ret; + + ignore =3D g_slist_prepend(NULL, child); + ret =3D bdrv_can_set_aio_context(new_child, parent_ctx, &ignore, NULL)= ; + g_slist_free(ignore); + if (ret) { + return ret; + } + + ignore =3D g_slist_prepend(NULL, child); + ret =3D bdrv_can_set_aio_context(parent, child_ctx, &ignore, errp); + g_slist_free(ignore); + return ret; +} + /* * Take a BDRVReopenState and check if the value of 'backing' in the * reopen_state->options QDict is valid or not. @@ -3838,14 +3861,11 @@ static int bdrv_reopen_parse_backing(BDRVReopenStat= e *reopen_state, } =20 /* - * TODO: before removing the x- prefix from x-blockdev-reopen we - * should move the new backing file into the right AioContext - * instead of returning an error. + * Check AioContext compatibility so that the bdrv_set_backing_hd() ca= ll in + * bdrv_reopen_commit() won't fail. */ if (new_backing_bs) { - if (bdrv_get_aio_context(new_backing_bs) !=3D bdrv_get_aio_context= (bs)) { - error_setg(errp, "Cannot use a new backing file " - "with a different AioContext"); + if (!bdrv_reopen_can_attach(bs, bs->backing, new_backing_bs, errp)= ) { return -EINVAL; } } diff --git a/tests/qemu-iotests/245 b/tests/qemu-iotests/245 index 7d9eb6285c..1001275a44 100755 --- a/tests/qemu-iotests/245 +++ b/tests/qemu-iotests/245 @@ -1015,18 +1015,16 @@ class TestBlockdevReopen(iotests.QMPTestCase): # neither of them can switch to the other AioContext def test_iothreads_error(self): self.run_test_iothreads('iothread0', 'iothread1', - "Cannot use a new backing file with a diff= erent AioContext") + "Cannot change iothread of active block ba= ckend") =20 def test_iothreads_compatible_users(self): self.run_test_iothreads('iothread0', 'iothread0') =20 def test_iothreads_switch_backing(self): - self.run_test_iothreads('iothread0', None, - "Cannot use a new backing file with a diff= erent AioContext") + self.run_test_iothreads('iothread0', None) =20 def test_iothreads_switch_overlay(self): - self.run_test_iothreads(None, 'iothread0', - "Cannot use a new backing file with a diff= erent AioContext") + self.run_test_iothreads(None, 'iothread0') =20 if __name__ =3D=3D '__main__': iotests.main(supported_fmts=3D["qcow2"], --=20 2.20.1