From nobody Tue Apr 15 09:53:06 2025 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; 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 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (208.118.235.17 [208.118.235.17]) by mx.zohomail.com with SMTPS id 1509024882233841.9600886724418; Thu, 26 Oct 2017 06:34:42 -0700 (PDT) Received: from localhost ([::1]:52942 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1e7iIu-0005Jp-Ar for importer@patchew.org; Thu, 26 Oct 2017 09:34:36 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:59073) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1e7i3f-0000qi-B3 for qemu-devel@nongnu.org; Thu, 26 Oct 2017 09:18:52 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1e7i3e-0002Mi-7z for qemu-devel@nongnu.org; Thu, 26 Oct 2017 09:18:51 -0400 Received: from mx1.redhat.com ([209.132.183.28]:53530) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1e7i3b-0002Jw-Vi; Thu, 26 Oct 2017 09:18:48 -0400 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 mx1.redhat.com (Postfix) with ESMTPS id 0BE73ACA4; Thu, 26 Oct 2017 13:18:47 +0000 (UTC) Received: from localhost.localdomain.com (unknown [10.36.118.24]) by smtp.corp.redhat.com (Postfix) with ESMTP id BC7717F5FF; Thu, 26 Oct 2017 13:18:45 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com 0BE73ACA4 Authentication-Results: ext-mx03.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx03.extmail.prod.ext.phx2.redhat.com; spf=fail smtp.mailfrom=kwolf@redhat.com From: Kevin Wolf To: qemu-block@nongnu.org Date: Thu, 26 Oct 2017 15:17:31 +0200 Message-Id: <20171026131741.5059-26-kwolf@redhat.com> In-Reply-To: <20171026131741.5059-1-kwolf@redhat.com> References: <20171026131741.5059-1-kwolf@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.27]); Thu, 26 Oct 2017 13:18:47 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PULL 25/35] qcow2: Reduce is_zero() rounding 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, qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail: RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" From: Eric Blake Now that bdrv_is_allocated accepts non-aligned inputs, we can remove the TODO added in earlier refactoring. Signed-off-by: Eric Blake Signed-off-by: Kevin Wolf --- block/qcow2.c | 12 +++--------- 1 file changed, 3 insertions(+), 9 deletions(-) diff --git a/block/qcow2.c b/block/qcow2.c index 29d0a50955..fbf9464d3a 100644 --- a/block/qcow2.c +++ b/block/qcow2.c @@ -2976,22 +2976,16 @@ static bool is_zero(BlockDriverState *bs, int64_t o= ffset, int64_t bytes) { int64_t nr; int res; - int64_t start; - - /* TODO: Widening to sector boundaries should only be needed as - * long as we can't query finer granularity. */ - start =3D QEMU_ALIGN_DOWN(offset, BDRV_SECTOR_SIZE); - bytes =3D QEMU_ALIGN_UP(offset + bytes, BDRV_SECTOR_SIZE) - start; =20 /* Clamp to image length, before checking status of underlying sectors= */ - if (start + bytes > bs->total_sectors * BDRV_SECTOR_SIZE) { - bytes =3D bs->total_sectors * BDRV_SECTOR_SIZE - start; + if (offset + bytes > bs->total_sectors * BDRV_SECTOR_SIZE) { + bytes =3D bs->total_sectors * BDRV_SECTOR_SIZE - offset; } =20 if (!bytes) { return true; } - res =3D bdrv_block_status_above(bs, NULL, start, bytes, &nr, NULL, NUL= L); + res =3D bdrv_block_status_above(bs, NULL, offset, bytes, &nr, NULL, NU= LL); return res >=3D 0 && (res & BDRV_BLOCK_ZERO) && nr =3D=3D bytes; } =20 --=20 2.13.6