From nobody Thu Nov 6 01:32:26 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; dmarc=fail(p=none dis=none) header.from=virtuozzo.com Return-Path: Received: from lists.gnu.org (208.118.235.17 [208.118.235.17]) by mx.zohomail.com with SMTPS id 1538389948327129.14369968856386; Mon, 1 Oct 2018 03:32:28 -0700 (PDT) Received: from localhost ([::1]:37164 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1g6vUv-0006DZ-6Y for importer@patchew.org; Mon, 01 Oct 2018 06:32:17 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:40379) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1g6vSN-0004qa-MH for qemu-devel@nongnu.org; Mon, 01 Oct 2018 06:29:40 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1g6vSK-0002LM-PX for qemu-devel@nongnu.org; Mon, 01 Oct 2018 06:29:39 -0400 Received: from relay.sw.ru ([185.231.240.75]:39686) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1g6vSK-0002JY-Dz; Mon, 01 Oct 2018 06:29:36 -0400 Received: from [10.28.8.145] (helo=kvm.sw.ru) by relay.sw.ru with esmtp (Exim 4.90_1) (envelope-from ) id 1g6vSE-0005Yj-8d; Mon, 01 Oct 2018 13:29:30 +0300 From: Vladimir Sementsov-Ogievskiy To: qemu-devel@nongnu.org, qemu-block@nongnu.org Date: Mon, 1 Oct 2018 13:29:12 +0300 Message-Id: <20181001102928.20533-3-vsementsov@virtuozzo.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20181001102928.20533-1-vsementsov@virtuozzo.com> References: <20181001102928.20533-1-vsementsov@virtuozzo.com> X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 185.231.240.75 Subject: [Qemu-devel] [PATCH v3 02/18] block/io: allow BDRV_REQ_SERIALISING for read 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, vsementsov@virtuozzo.com, famz@redhat.com, wencongyang2@huawei.com, xiechanglong.d@gmail.com, armbru@redhat.com, mreitz@redhat.com, stefanha@redhat.com, den@openvz.org, jsnow@redhat.com, jcody@redhat.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail: RDMRC_1 RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" It will be used in further commit, changing backup architecture. Signed-off-by: Vladimir Sementsov-Ogievskiy --- block/io.c | 13 ++++++------- 1 file changed, 6 insertions(+), 7 deletions(-) diff --git a/block/io.c b/block/io.c index bd9d688f8b..b003b4d5bf 100644 --- a/block/io.c +++ b/block/io.c @@ -1318,10 +1318,11 @@ static int coroutine_fn bdrv_aligned_preadv(BdrvChi= ld *child, * potential fallback support, if we ever implement any read flags * to pass through to drivers. For now, there aren't any * passthrough flags. */ - assert(!(flags & ~(BDRV_REQ_NO_SERIALISING | BDRV_REQ_COPY_ON_READ))); + assert(!(flags & ~(BDRV_REQ_NO_SERIALISING | BDRV_REQ_COPY_ON_READ | + BDRV_REQ_SERIALISING))); =20 /* Handle Copy on Read and associated serialisation */ - if (flags & BDRV_REQ_COPY_ON_READ) { + if (flags & (BDRV_REQ_COPY_ON_READ | BDRV_REQ_SERIALISING)) { /* If we touch the same cluster it counts as an overlap. This * guarantees that allocating writes will be serialized and not ra= ce * with each other for the same cluster. For example, in copy-on-= read @@ -1330,9 +1331,6 @@ static int coroutine_fn bdrv_aligned_preadv(BdrvChild= *child, mark_request_serialising(req, bdrv_get_cluster_size(bs)); } =20 - /* BDRV_REQ_SERIALISING is only for write operation */ - assert(!(flags & BDRV_REQ_SERIALISING)); - if (!(flags & BDRV_REQ_NO_SERIALISING)) { wait_serialising_requests(req); } @@ -3027,8 +3025,9 @@ static int coroutine_fn bdrv_co_copy_range_internal( tracked_request_begin(&req, src->bs, src_offset, bytes, BDRV_TRACKED_READ); =20 - /* BDRV_REQ_SERIALISING is only for write operation */ - assert(!(read_flags & BDRV_REQ_SERIALISING)); + if (read_flags & BDRV_REQ_SERIALISING) { + mark_request_serialising(&req, bdrv_get_cluster_size(src->bs)); + } if (!(read_flags & BDRV_REQ_NO_SERIALISING)) { wait_serialising_requests(&req); } --=20 2.18.0