From patchwork Fri May 26 16:55:13 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Max Reitz X-Patchwork-Id: 9750871 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id EA0DE60209 for ; Fri, 26 May 2017 17:07:07 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id CF65F28332 for ; Fri, 26 May 2017 17:07:07 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id C270F28403; Fri, 26 May 2017 17:07:07 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 45C8328332 for ; Fri, 26 May 2017 17:07:06 +0000 (UTC) Received: from localhost ([::1]:37662 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dEIhe-00015D-6C for patchwork-qemu-devel@patchwork.kernel.org; Fri, 26 May 2017 13:07:06 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:41742) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dEIX6-00007k-HK for qemu-devel@nongnu.org; Fri, 26 May 2017 12:56:13 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dEIX5-0003kd-Os for qemu-devel@nongnu.org; Fri, 26 May 2017 12:56:12 -0400 Received: from mx1.redhat.com ([209.132.183.28]:48118) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1dEIX1-0003jm-SH; Fri, 26 May 2017 12:56:07 -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 BAAF4C0B39E2; Fri, 26 May 2017 16:56:06 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com BAAF4C0B39E2 Authentication-Results: ext-mx08.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx08.extmail.prod.ext.phx2.redhat.com; spf=pass smtp.mailfrom=mreitz@redhat.com DKIM-Filter: OpenDKIM Filter v2.11.0 mx1.redhat.com BAAF4C0B39E2 Received: from localhost (unknown [10.40.205.98]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 3462A7F49B; Fri, 26 May 2017 16:56:06 +0000 (UTC) From: Max Reitz To: qemu-block@nongnu.org Date: Fri, 26 May 2017 18:55:13 +0200 Message-Id: <20170526165518.7580-12-mreitz@redhat.com> In-Reply-To: <20170526165518.7580-1-mreitz@redhat.com> References: <20170526165518.7580-1-mreitz@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 [10.5.110.32]); Fri, 26 May 2017 16:56:06 +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 v3 11/16] block/qcow2: Metadata preallocation for truncate 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 , qemu-devel@nongnu.org, Stefan Hajnoczi , Max Reitz Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP We can support PREALLOC_MODE_METADATA by invoking preallocate() in qcow2_truncate(). Signed-off-by: Max Reitz Reviewed-by: Stefan Hajnoczi --- block/qcow2.c | 24 ++++++++++++++++++++++-- 1 file changed, 22 insertions(+), 2 deletions(-) diff --git a/block/qcow2.c b/block/qcow2.c index a8223a0..2de27c3 100644 --- a/block/qcow2.c +++ b/block/qcow2.c @@ -2616,10 +2616,11 @@ static int qcow2_truncate(BlockDriverState *bs, int64_t offset, PreallocMode prealloc, Error **errp) { BDRVQcow2State *s = bs->opaque; + uint64_t old_length; int64_t new_l1_size; int ret; - if (prealloc != PREALLOC_MODE_OFF) { + if (prealloc != PREALLOC_MODE_OFF && prealloc != PREALLOC_MODE_METADATA) { error_setg(errp, "Unsupported preallocation mode '%s'", PreallocMode_lookup[prealloc]); return -ENOTSUP; @@ -2636,8 +2637,10 @@ static int qcow2_truncate(BlockDriverState *bs, int64_t offset, return -ENOTSUP; } + old_length = bs->total_sectors * 512; + /* shrinking is currently not supported */ - if (offset < bs->total_sectors * 512) { + if (offset < old_length) { error_setg(errp, "qcow2 doesn't support shrinking images yet"); return -ENOTSUP; } @@ -2649,6 +2652,23 @@ static int qcow2_truncate(BlockDriverState *bs, int64_t offset, return ret; } + switch (prealloc) { + case PREALLOC_MODE_OFF: + break; + + case PREALLOC_MODE_METADATA: + ret = preallocate(bs, old_length, offset); + if (ret < 0) { + error_setg_errno(errp, -ret, "Preallocation failed, image may now " + "occupy more space than necessary"); + return ret; + } + break; + + default: + g_assert_not_reached(); + } + /* write updated header.size */ offset = cpu_to_be64(offset); ret = bdrv_pwrite_sync(bs->file, offsetof(QCowHeader, size),