From nobody Tue Feb 10 01:33:13 2026 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; dkim=fail; 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=1572267990; cv=none; d=zoho.com; s=zohoarc; b=K/d81gVATOy4bQtH22Pgxb/50dFWqyDX6lgnqS02jzoip6ODbM0iNaD3bS6miPY2itXyOkRpS0z1Nf2kD4FTXyf/bk/eFQ/9mxNnx8dXm50Ss+DsOUlOUv5XqIECvXR1oDnkkxuHS5QRYIQgZKoJpwLFf0mXtWibQTCBaWkJzBs= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zoho.com; s=zohoarc; t=1572267990; h=Content-Type: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; bh=FQH891K9cRbxEVZvL7E4z3vBB3xxoYPbvBEZln4pkVQ=; b=NVbgEs9Go8B9M6BDeQgZa30oiffvU70RGjkT0fU0v8A3SyAWkTXDpdI75DPouQOMujVy0K/Ml1oh3CMgqTZTg4AA9ALmOtj8RBv0nyTaN5lV+hAsG4np1Dh+vyHdaMNlMRcA2+KvCAzCu01mXotu5zB3X+3IhIkw1+B8WP7Z1FY= ARC-Authentication-Results: i=1; mx.zoho.com; dkim=fail; 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 157226799017052.55290482053567; Mon, 28 Oct 2019 06:06:30 -0700 (PDT) Received: from localhost ([::1]:53544 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iP4j2-0007Iy-IQ for importer@patchew.org; Mon, 28 Oct 2019 09:06:24 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:50556) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iP3wc-0002Rn-Eo for qemu-devel@nongnu.org; Mon, 28 Oct 2019 08:16:23 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1iP3wb-0001o8-5m for qemu-devel@nongnu.org; Mon, 28 Oct 2019 08:16:22 -0400 Received: from us-smtp-1.mimecast.com ([207.211.31.81]:41699 helo=us-smtp-delivery-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1iP3wa-0001nl-Vm for qemu-devel@nongnu.org; Mon, 28 Oct 2019 08:16:21 -0400 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-391-UUWKxpB8MbG7Yg3hWyY8VQ-1; Mon, 28 Oct 2019 08:16:18 -0400 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id C0D26800FF1; Mon, 28 Oct 2019 12:16:17 +0000 (UTC) Received: from localhost (ovpn-117-83.ams2.redhat.com [10.36.117.83]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 6298F6084E; Mon, 28 Oct 2019 12:16:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1572264980; 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=FQH891K9cRbxEVZvL7E4z3vBB3xxoYPbvBEZln4pkVQ=; b=R0iG9ZPstwVyO2iiS6PtuPShr0XfTn/+xgJfCrz55ipggzUE9QjsINFnLHbIm0iSBCU/kp XaoOeVLOPAJvAaxON8VHLqPyJP4pswa8r2lAacCQR1VnalBzjnFu7TmXDQErtqgyR+shRM 8fNMZ3IIFipTRxbZM2RhoQLmqrklS8A= From: Max Reitz To: qemu-block@nongnu.org Subject: [PULL 36/69] block/block-copy: allocate buffer in block_copy_with_bounce_buffer Date: Mon, 28 Oct 2019 13:14:28 +0100 Message-Id: <20191028121501.15279-37-mreitz@redhat.com> In-Reply-To: <20191028121501.15279-1-mreitz@redhat.com> References: <20191028121501.15279-1-mreitz@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-MC-Unique: UUWKxpB8MbG7Yg3hWyY8VQ-1 X-Mimecast-Spam-Score: 0 Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 207.211.31.81 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 , Peter Maydell , qemu-devel@nongnu.org, Max Reitz Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" From: Vladimir Sementsov-Ogievskiy Move bounce_buffer allocation block_copy_with_bounce_buffer. This commit simplifies further work on implementing copying by larger chunks (of different size) and further asynchronous handling of block_copy iterations (with help of block/aio_task API). Allocation works fast, a lot faster than disk io, so it's not a problem that we now allocate/free bounce_buffer more times. And we anyway will have to allocate several bounce_buffers for parallel execution of loop iterations in future. Signed-off-by: Vladimir Sementsov-Ogievskiy Reviewed-by: Max Reitz Message-id: 20191022111805.3432-2-vsementsov@virtuozzo.com Signed-off-by: Max Reitz --- block/block-copy.c | 21 ++++++++------------- 1 file changed, 8 insertions(+), 13 deletions(-) diff --git a/block/block-copy.c b/block/block-copy.c index 066e3a7274..ecd086010e 100644 --- a/block/block-copy.c +++ b/block/block-copy.c @@ -126,20 +126,17 @@ void block_copy_set_callbacks( static int coroutine_fn block_copy_with_bounce_buffer(BlockCopyState *s, int64_t start, int64_t end, - bool *error_is_read, - void **bounce_buffer) + bool *error_is_read) { int ret; int nbytes; + void *bounce_buffer =3D qemu_blockalign(s->source->bs, s->cluster_size= ); =20 assert(QEMU_IS_ALIGNED(start, s->cluster_size)); bdrv_reset_dirty_bitmap(s->copy_bitmap, start, s->cluster_size); nbytes =3D MIN(s->cluster_size, s->len - start); - if (!*bounce_buffer) { - *bounce_buffer =3D qemu_blockalign(s->source->bs, s->cluster_size); - } =20 - ret =3D bdrv_co_pread(s->source, start, nbytes, *bounce_buffer, 0); + ret =3D bdrv_co_pread(s->source, start, nbytes, bounce_buffer, 0); if (ret < 0) { trace_block_copy_with_bounce_buffer_read_fail(s, start, ret); if (error_is_read) { @@ -148,7 +145,7 @@ static int coroutine_fn block_copy_with_bounce_buffer(B= lockCopyState *s, goto fail; } =20 - ret =3D bdrv_co_pwrite(s->target, start, nbytes, *bounce_buffer, + ret =3D bdrv_co_pwrite(s->target, start, nbytes, bounce_buffer, s->write_flags); if (ret < 0) { trace_block_copy_with_bounce_buffer_write_fail(s, start, ret); @@ -158,8 +155,11 @@ static int coroutine_fn block_copy_with_bounce_buffer(= BlockCopyState *s, goto fail; } =20 + qemu_vfree(bounce_buffer); + return nbytes; fail: + qemu_vfree(bounce_buffer); bdrv_set_dirty_bitmap(s->copy_bitmap, start, s->cluster_size); return ret; =20 @@ -271,7 +271,6 @@ int coroutine_fn block_copy(BlockCopyState *s, { int ret =3D 0; int64_t end =3D bytes + start; /* bytes */ - void *bounce_buffer =3D NULL; int64_t status_bytes; BlockCopyInFlightReq req; =20 @@ -324,7 +323,7 @@ int coroutine_fn block_copy(BlockCopyState *s, } if (!s->use_copy_range) { ret =3D block_copy_with_bounce_buffer(s, start, dirty_end, - error_is_read, &bounce_buf= fer); + error_is_read); } if (ret < 0) { break; @@ -335,10 +334,6 @@ int coroutine_fn block_copy(BlockCopyState *s, ret =3D 0; } =20 - if (bounce_buffer) { - qemu_vfree(bounce_buffer); - } - block_copy_inflight_req_end(&req); =20 return ret; --=20 2.21.0