From nobody Mon Feb 9 09:52:33 2026 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.zoho.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 (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 149496786452914.335069658344082; Tue, 16 May 2017 13:51:04 -0700 (PDT) Received: from localhost ([::1]:43957 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dAjQt-0004tU-55 for importer@patchew.org; Tue, 16 May 2017 16:51:03 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:41430) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dAjO3-0002ut-9P for qemu-devel@nongnu.org; Tue, 16 May 2017 16:48:08 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dAjO2-0003i5-FC for qemu-devel@nongnu.org; Tue, 16 May 2017 16:48:07 -0400 Received: from mx1.redhat.com ([209.132.183.28]:60374) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1dAjNw-0003f9-RV; Tue, 16 May 2017 16:48:01 -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 6FA08804FA; Tue, 16 May 2017 20:47:54 +0000 (UTC) Received: from red.redhat.com (ovpn-123-244.rdu2.redhat.com [10.10.123.244]) by smtp.corp.redhat.com (Postfix) with ESMTP id 491C018AB2; Tue, 16 May 2017 20:47:53 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com 6FA08804FA 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=pass smtp.mailfrom=eblake@redhat.com DKIM-Filter: OpenDKIM Filter v2.11.0 mx1.redhat.com 6FA08804FA From: Eric Blake To: qemu-devel@nongnu.org Date: Tue, 16 May 2017 15:47:22 -0500 Message-Id: <20170516204724.1617-11-eblake@redhat.com> In-Reply-To: <20170516204724.1617-1-eblake@redhat.com> References: <20170516204724.1617-1-eblake@redhat.com> 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 [10.5.110.27]); Tue, 16 May 2017 20:47:54 +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] [PATCH v2 10/12] mirror: Switch mirror_dirty_init() to byte-based iteration 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: Kevin Wolf , Jeff Cody , jsnow@redhat.com, qemu-block@nongnu.org, Max Reitz 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" Now that we have adjusted the majority of the calls this function makes to be byte-based, it is easier to read the code if it makes passes over the image using bytes rather than sectors. Signed-off-by: Eric Blake Reviewed-by: John Snow --- v2: no change --- block/mirror.c | 35 ++++++++++++++--------------------- 1 file changed, 14 insertions(+), 21 deletions(-) diff --git a/block/mirror.c b/block/mirror.c index b4fe259..6cfa57c 100644 --- a/block/mirror.c +++ b/block/mirror.c @@ -601,15 +601,13 @@ static void mirror_throttle(MirrorBlockJob *s) static int coroutine_fn mirror_dirty_init(MirrorBlockJob *s) { - int64_t sector_num, end; + int64_t offset; BlockDriverState *base =3D s->base; BlockDriverState *bs =3D s->source; BlockDriverState *target_bs =3D blk_bs(s->target); - int ret, n; + int ret; int64_t count; - end =3D s->bdev_length / BDRV_SECTOR_SIZE; - if (base =3D=3D NULL && !bdrv_has_zero_init(target_bs)) { if (!bdrv_can_write_zeroes_with_unmap(target_bs)) { bdrv_set_dirty_bitmap(s->dirty_bitmap, 0, s->bdev_length); @@ -617,9 +615,9 @@ static int coroutine_fn mirror_dirty_init(MirrorBlockJo= b *s) } s->initial_zeroing_ongoing =3D true; - for (sector_num =3D 0; sector_num < end; ) { - int nb_sectors =3D MIN(end - sector_num, - QEMU_ALIGN_DOWN(INT_MAX, s->granularity) >> BDRV_SECTOR_BI= TS); + for (offset =3D 0; offset < s->bdev_length; ) { + int bytes =3D MIN(s->bdev_length - offset, + QEMU_ALIGN_DOWN(INT_MAX, s->granularity)); mirror_throttle(s); @@ -635,9 +633,8 @@ static int coroutine_fn mirror_dirty_init(MirrorBlockJo= b *s) continue; } - mirror_do_zero_or_discard(s, sector_num * BDRV_SECTOR_SIZE, - nb_sectors * BDRV_SECTOR_SIZE, false= ); - sector_num +=3D nb_sectors; + mirror_do_zero_or_discard(s, offset, bytes, false); + offset +=3D bytes; } mirror_wait_for_all_io(s); @@ -645,10 +642,10 @@ static int coroutine_fn mirror_dirty_init(MirrorBlock= Job *s) } /* First part, loop on the sectors and initialize the dirty bitmap. */ - for (sector_num =3D 0; sector_num < end; ) { + for (offset =3D 0; offset < s->bdev_length; ) { /* Just to make sure we are not exceeding int limit. */ - int nb_sectors =3D MIN(INT_MAX >> BDRV_SECTOR_BITS, - end - sector_num); + int bytes =3D MIN(s->bdev_length - offset, + QEMU_ALIGN_DOWN(INT_MAX, s->granularity)); mirror_throttle(s); @@ -656,20 +653,16 @@ static int coroutine_fn mirror_dirty_init(MirrorBlock= Job *s) return 0; } - ret =3D bdrv_is_allocated_above(bs, base, sector_num * BDRV_SECTOR= _SIZE, - nb_sectors * BDRV_SECTOR_SIZE, &coun= t); + ret =3D bdrv_is_allocated_above(bs, base, offset, bytes, &count); if (ret < 0) { return ret; } - n =3D DIV_ROUND_UP(count, BDRV_SECTOR_SIZE); - assert(n > 0); + count =3D QEMU_ALIGN_UP(count, BDRV_SECTOR_SIZE); if (ret =3D=3D 1) { - bdrv_set_dirty_bitmap(s->dirty_bitmap, - sector_num * BDRV_SECTOR_SIZE, - n * BDRV_SECTOR_SIZE); + bdrv_set_dirty_bitmap(s->dirty_bitmap, offset, count); } - sector_num +=3D n; + offset +=3D count; } return 0; } --=20 2.9.4