From patchwork Tue Dec 11 16:43:15 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vladimir Sementsov-Ogievskiy X-Patchwork-Id: 1011215 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=nongnu.org (client-ip=2001:4830:134:3::11; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dmarc=fail (p=none dis=none) header.from=virtuozzo.com Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 43DmCN6TxPz9s3Z for ; Wed, 12 Dec 2018 03:50:24 +1100 (AEDT) Received: from localhost ([::1]:40062 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gWlEk-00006a-Bt for incoming@patchwork.ozlabs.org; Tue, 11 Dec 2018 11:50:22 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:42053) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gWl85-0001u5-CI for qemu-devel@nongnu.org; Tue, 11 Dec 2018 11:43:30 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gWl84-0004KK-Bt for qemu-devel@nongnu.org; Tue, 11 Dec 2018 11:43:29 -0500 Received: from relay.sw.ru ([185.231.240.75]:47268) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1gWl82-0004DO-79; Tue, 11 Dec 2018 11:43:28 -0500 Received: from [10.28.8.145] (helo=kvm.sw.ru) by relay.sw.ru with esmtp (Exim 4.91) (envelope-from ) id 1gWl7v-0001lo-SY; Tue, 11 Dec 2018 19:43:19 +0300 From: Vladimir Sementsov-Ogievskiy To: qemu-devel@nongnu.org, qemu-block@nongnu.org Date: Tue, 11 Dec 2018 19:43:15 +0300 Message-Id: <20181211164317.32893-7-vsementsov@virtuozzo.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20181211164317.32893-1-vsementsov@virtuozzo.com> References: <20181211164317.32893-1-vsementsov@virtuozzo.com> X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [fuzzy] X-Received-From: 185.231.240.75 Subject: [Qemu-devel] [PATCH v2 6/8] qcow2: qcow2_co_preadv: skip using hd_qiov when possible 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, berto@igalia.com, mreitz@redhat.com, den@openvz.org Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" qemu_iovec_memset has @offset parameter, so using hd_qiov for it is not needed. Signed-off-by: Vladimir Sementsov-Ogievskiy --- block/qcow2.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/block/qcow2.c b/block/qcow2.c index 2a49314e42..4e217ee918 100644 --- a/block/qcow2.c +++ b/block/qcow2.c @@ -1888,18 +1888,13 @@ static coroutine_fn int qcow2_co_preadv(BlockDriverState *bs, uint64_t offset, goto fail; } - offset_in_cluster = offset_into_cluster(s, offset); - - qemu_iovec_reset(&hd_qiov); - qemu_iovec_concat(&hd_qiov, qiov, bytes_done, cur_bytes); - if (ret == QCOW2_CLUSTER_ZERO_PLAIN || ret == QCOW2_CLUSTER_ZERO_ALLOC || (ret == QCOW2_CLUSTER_UNALLOCATED && !bs->backing)) { /* No sense in releasing the lock */ - qemu_iovec_memset(&hd_qiov, 0, 0, cur_bytes); + qemu_iovec_memset(qiov, bytes_done, 0, cur_bytes); bytes -= cur_bytes; offset += cur_bytes; @@ -1907,6 +1902,11 @@ static coroutine_fn int qcow2_co_preadv(BlockDriverState *bs, uint64_t offset, continue; } + offset_in_cluster = offset_into_cluster(s, offset); + + qemu_iovec_reset(&hd_qiov); + qemu_iovec_concat(&hd_qiov, qiov, bytes_done, cur_bytes); + qemu_co_mutex_unlock(&s->lock); switch (ret) {