From nobody Tue Nov 11 05:12:24 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=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1560958762; cv=none; d=zoho.com; s=zohoarc; b=lq9mJrBOTsyYNTUtNK/gu0GTImnIULA3+AiU/IoLEZbO+yYRxcCslvUxU4xX6oRwBgysfdj8U/6KupC9bPFcOGgcMf/Cl7iLhaFZ+YusVmQRbA2jqf6ay7wrMdJUpzOeJsC2y02O5p8KzUdke5AZCvhQDPr86iHfhWAAl2T3BZM= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zoho.com; s=zohoarc; t=1560958762; h=Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To:ARC-Authentication-Results; bh=FMsRkha06iQLKcQtIo5COPxqTlVTGPo64DnHKt0cxH4=; b=ZtNYVFNMi4m3Ikv8K4lmc2rJJQaruNjZxGuOF8Hk6nq5TYjJX3FDpizVm7/puKncdrQoeo8xDjA2iTi3HNab+UUtp1ec+LmqwznzrgN+oEotbhKSKmph7GCbBh1VtIlKn1Pwy8zscmdYNgyVcVOwLaIUf3dG61u3ZjTEXb9KPGs= 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 1560958762407891.8105213522756; Wed, 19 Jun 2019 08:39:22 -0700 (PDT) Received: from localhost ([::1]:39534 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hdcgB-0008Sh-8O for importer@patchew.org; Wed, 19 Jun 2019 11:39:19 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:42578) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hdcU1-0003TJ-BD for qemu-devel@nongnu.org; Wed, 19 Jun 2019 11:26:46 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hdcU0-0002G1-9E for qemu-devel@nongnu.org; Wed, 19 Jun 2019 11:26:45 -0400 Received: from mx1.redhat.com ([209.132.183.28]:56020) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hdcTx-00020a-NH; Wed, 19 Jun 2019 11:26:41 -0400 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 261BBF74CE; Wed, 19 Jun 2019 15:26:19 +0000 (UTC) Received: from localhost (ovpn-116-121.ams2.redhat.com [10.36.116.121]) by smtp.corp.redhat.com (Postfix) with ESMTPS id B209B601A5; Wed, 19 Jun 2019 15:26:18 +0000 (UTC) From: Max Reitz To: qemu-block@nongnu.org Date: Wed, 19 Jun 2019 17:25:57 +0200 Message-Id: <20190619152603.5937-4-mreitz@redhat.com> In-Reply-To: <20190619152603.5937-1-mreitz@redhat.com> References: <20190619152603.5937-1-mreitz@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.38]); Wed, 19 Jun 2019 15:26:19 +0000 (UTC) Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH v2 3/9] block: Add bdrv_poll_drain_data_objs() 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: Kevin Wolf , qemu-devel@nongnu.org, Stefan Hajnoczi , Max Reitz Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Type: text/plain; charset="utf-8" This function polls all of the involved AioContexts for a GSList of BdrvCoDrainData objects until all objects' .done is true. Signed-off-by: Max Reitz --- block/io.c | 57 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 57 insertions(+) diff --git a/block/io.c b/block/io.c index 6b518e5eb0..eb84774abd 100644 --- a/block/io.c +++ b/block/io.c @@ -255,6 +255,63 @@ static void bdrv_drain_invoke(BlockDriverState *bs, bo= ol begin, } } =20 +/* TODO: Actually use this function and drop this forward declaration */ +static void bdrv_poll_drain_data_objs(GSList **data_objs, bool acquire_ctx) + __attribute__((unused)); + +/* + * Poll the AioContexts in the given list of BdrvCoDrainData objects + * until all of those objects are "done" (i.e. their .done field is + * true). + * Also, free all objects and the list. + * + * If @acquire_ctx is true, the AioContexts are locked while they are + * polled. + */ +static void bdrv_poll_drain_data_objs(GSList **data_objs, bool acquire_ctx) +{ + GSList *contexts =3D NULL; + GSList *iter; + + /* First collect the contexts while the BDSs are not gone */ + for (iter =3D *data_objs; iter; iter =3D iter->next) { + BdrvCoDrainData *drain_data =3D iter->data; + contexts =3D g_slist_prepend(contexts, + bdrv_get_aio_context(drain_data->bs)); + } + + /* + * Reverse the list so it is in the same order as *data_objs + * (prepend and then reverse has better performance than appending) + */ + contexts =3D g_slist_reverse(contexts); + + /* The BDSs may disappear here, but we only need their contexts */ + while (*data_objs) { + GSList *next; + BdrvCoDrainData *drain_data =3D (*data_objs)->data; + AioContext *ctx =3D contexts->data; + + if (acquire_ctx) { + aio_context_acquire(ctx); + } + AIO_WAIT_WHILE(ctx, !drain_data->done); + if (acquire_ctx) { + aio_context_release(ctx); + } + + g_free(drain_data); + + next =3D (*data_objs)->next; + g_slist_free_1(*data_objs); + *data_objs =3D next; + + next =3D contexts->next; + g_slist_free_1(contexts); + contexts =3D next; + } +} + /* Returns true if BDRV_POLL_WHILE() should go into a blocking aio_poll() = */ bool bdrv_drain_poll(BlockDriverState *bs, bool recursive, BdrvChild *ignore_parent, bool ignore_bds_parents) --=20 2.21.0