From patchwork Thu Jun 17 15:52:45 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Max Reitz X-Patchwork-Id: 12328273 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=-13.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,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 985D4C2B9F4 for ; Thu, 17 Jun 2021 16:01:56 +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 2E7D06120A for ; Thu, 17 Jun 2021 16:01:56 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2E7D06120A 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]:53750 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ltuSp-0006VP-8f for qemu-devel@archiver.kernel.org; Thu, 17 Jun 2021 12:01:55 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:43828) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ltuKE-0005ik-Br for qemu-devel@nongnu.org; Thu, 17 Jun 2021 11:53:02 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:59988) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ltuKC-0001In-1F for qemu-devel@nongnu.org; Thu, 17 Jun 2021 11:53:02 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1623945179; 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=WDX7I1KjPi61ZunKAVKvnIGh+NM6+5nggCp5R/S3BF4=; b=Oh9iQdmHBo9qr0LaMCnQ1Ja6ZotrTqvs8V0mcktniaPpnnZxcJR9rbXIdWp9VGVBte+mg0 nkX/lvSaXSBt5rglHs2NstEp7rdwbNd9/BeUbWIskAUXSOpc+9hxjTcQT29CHRc9PGJYhZ cx2GwGGIQZY2Ma2Wy3Cjt5tGznUcj1I= 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-270-EWSKyhnUNWqO6HThwL_-7Q-1; Thu, 17 Jun 2021 11:52:58 -0400 X-MC-Unique: EWSKyhnUNWqO6HThwL_-7Q-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 51C2A8797F6; Thu, 17 Jun 2021 15:52:57 +0000 (UTC) Received: from localhost (ovpn-114-231.ams2.redhat.com [10.36.114.231]) by smtp.corp.redhat.com (Postfix) with ESMTPS id ED6695D9C6; Thu, 17 Jun 2021 15:52:56 +0000 (UTC) From: Max Reitz To: qemu-block@nongnu.org Subject: [PATCH 4/6] block/gluster: Do not force-cap *pnum Date: Thu, 17 Jun 2021 17:52:45 +0200 Message-Id: <20210617155247.442150-5-mreitz@redhat.com> In-Reply-To: <20210617155247.442150-1-mreitz@redhat.com> References: <20210617155247.442150-1-mreitz@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=mreitz@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=170.10.133.124; envelope-from=mreitz@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -29 X-Spam_score: -3.0 X-Spam_bar: --- X-Spam_report: (-3.0 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.197, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no 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 , qemu-devel@nongnu.org, Max Reitz Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" bdrv_co_block_status() does it for us, we do not need to do it here. The advantage of not capping *pnum is that bdrv_co_block_status() can cache larger data regions than requested by its caller. Signed-off-by: Max Reitz Reviewed-by: Eric Blake Reviewed-by: Vladimir Sementsov-Ogievskiy --- block/gluster.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/block/gluster.c b/block/gluster.c index e8ee14c8e9..8ef7bb18d5 100644 --- a/block/gluster.c +++ b/block/gluster.c @@ -1461,7 +1461,8 @@ exit: * the specified offset) that are known to be in the same * allocated/unallocated state. * - * 'bytes' is the max value 'pnum' should be set to. + * 'bytes' is a soft cap for 'pnum'. If the information is free, 'pnum' may + * well exceed it. * * (Based on raw_co_block_status() from file-posix.c.) */ @@ -1500,12 +1501,12 @@ static int coroutine_fn qemu_gluster_co_block_status(BlockDriverState *bs, } else if (data == offset) { /* On a data extent, compute bytes to the end of the extent, * possibly including a partial sector at EOF. */ - *pnum = MIN(bytes, hole - offset); + *pnum = hole - offset; ret = BDRV_BLOCK_DATA; } else { /* On a hole, compute bytes to the beginning of the next extent. */ assert(hole == offset); - *pnum = MIN(bytes, data - offset); + *pnum = data - offset; ret = BDRV_BLOCK_ZERO; }