From patchwork Thu Jun 25 15:21:48 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Max Reitz X-Patchwork-Id: 279441 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=-6.8 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, 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 05717C433DF for ; Thu, 25 Jun 2020 15:38:05 +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 C3779208C9 for ; Thu, 25 Jun 2020 15:38:04 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="EJSnR19m" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C3779208C9 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]:47450 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1joTwy-0002Js-2K for qemu-devel@archiver.kernel.org; Thu, 25 Jun 2020 11:38:04 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:37408) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1joTiW-0005sR-UR for qemu-devel@nongnu.org; Thu, 25 Jun 2020 11:23:08 -0400 Received: from us-smtp-delivery-1.mimecast.com ([207.211.31.120]:30685 helo=us-smtp-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1joTiU-00010s-P9 for qemu-devel@nongnu.org; Thu, 25 Jun 2020 11:23:08 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1593098586; 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=7GdG7y/uVIjtA/pzRCXGa+y8uc64e6boF3Zk7jcxT44=; b=EJSnR19mzGY+jGUoY0cj7IrBlfMWc21Z6D3P4G/J1lIyvdtWJCfNjxVk+MTuXpuM3KOYi6 /LGm4oVpOaVoDZpz4YdIKcRNHxP5o8QcVsXpzxBTj38hHKdTb4un1S+o2WfExM/bXUmwvD 0l7otA8938zoMrdqf7RZ1l08BcXi7bU= 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-403-dX8h4n6SMQ-qJoeN3JS1Wg-1; Thu, 25 Jun 2020 11:23:04 -0400 X-MC-Unique: dX8h4n6SMQ-qJoeN3JS1Wg-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 44104804002; Thu, 25 Jun 2020 15:23:03 +0000 (UTC) Received: from localhost (ovpn-113-182.ams2.redhat.com [10.36.113.182]) by smtp.corp.redhat.com (Postfix) with ESMTPS id DECC460BE1; Thu, 25 Jun 2020 15:23:02 +0000 (UTC) From: Max Reitz To: qemu-block@nongnu.org Subject: [PATCH v7 20/47] block: Iterate over children in refresh_limits Date: Thu, 25 Jun 2020 17:21:48 +0200 Message-Id: <20200625152215.941773-21-mreitz@redhat.com> In-Reply-To: <20200625152215.941773-1-mreitz@redhat.com> References: <20200625152215.941773-1-mreitz@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=207.211.31.120; envelope-from=mreitz@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/06/25 01:47:53 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=_AUTOLEARN X-Spam_action: no action 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 , Vladimir Sementsov-Ogievskiy , qemu-devel@nongnu.org, Max Reitz Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Instead of looking at just bs->file and bs->backing, we should look at all children that could end up receiving forwarded requests. Signed-off-by: Max Reitz --- block/io.c | 32 ++++++++++++++++---------------- 1 file changed, 16 insertions(+), 16 deletions(-) diff --git a/block/io.c b/block/io.c index c2af7711d6..37057f13e0 100644 --- a/block/io.c +++ b/block/io.c @@ -135,6 +135,8 @@ static void bdrv_merge_limits(BlockLimits *dst, const BlockLimits *src) void bdrv_refresh_limits(BlockDriverState *bs, Error **errp) { BlockDriver *drv = bs->drv; + BdrvChild *c; + bool have_limits; Error *local_err = NULL; memset(&bs->bl, 0, sizeof(bs->bl)); @@ -149,14 +151,21 @@ void bdrv_refresh_limits(BlockDriverState *bs, Error **errp) drv->bdrv_co_preadv_part) ? 1 : 512; /* Take some limits from the children as a default */ - if (bs->file) { - bdrv_refresh_limits(bs->file->bs, &local_err); - if (local_err) { - error_propagate(errp, local_err); - return; + have_limits = false; + QLIST_FOREACH(c, &bs->children, next) { + if (c->role & (BDRV_CHILD_DATA | BDRV_CHILD_FILTERED | BDRV_CHILD_COW)) + { + bdrv_refresh_limits(c->bs, &local_err); + if (local_err) { + error_propagate(errp, local_err); + return; + } + bdrv_merge_limits(&bs->bl, &c->bs->bl); + have_limits = true; } - bdrv_merge_limits(&bs->bl, &bs->file->bs->bl); - } else { + } + + if (!have_limits) { bs->bl.min_mem_alignment = 512; bs->bl.opt_mem_alignment = qemu_real_host_page_size; @@ -164,15 +173,6 @@ void bdrv_refresh_limits(BlockDriverState *bs, Error **errp) bs->bl.max_iov = IOV_MAX; } - if (bs->backing) { - bdrv_refresh_limits(bs->backing->bs, &local_err); - if (local_err) { - error_propagate(errp, local_err); - return; - } - bdrv_merge_limits(&bs->bl, &bs->backing->bs->bl); - } - /* Then let the driver override it */ if (drv->bdrv_refresh_limits) { drv->bdrv_refresh_limits(bs, errp);