From patchwork Mon Apr 20 13:32:11 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kevin Wolf X-Patchwork-Id: 284187 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.5 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id F3139C3A5A0 for ; Mon, 20 Apr 2020 13:39:28 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id BE69520857 for ; Mon, 20 Apr 2020 13:39:28 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="FHSF/nxS" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org BE69520857 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:35818 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jQWdz-0005Yz-SY for qemu-devel@archiver.kernel.org; Mon, 20 Apr 2020 09:39:27 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:60934 helo=eggs1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jQWXn-0004Ny-5K for qemu-devel@nongnu.org; Mon, 20 Apr 2020 09:33:06 -0400 Received: from Debian-exim by eggs1p.gnu.org with spam-scanned (Exim 4.90_1) (envelope-from ) id 1jQWXc-0004hv-Uy for qemu-devel@nongnu.org; Mon, 20 Apr 2020 09:33:02 -0400 Received: from us-smtp-delivery-1.mimecast.com ([205.139.110.120]:60206 helo=us-smtp-1.mimecast.com) by eggs1p.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1jQWXc-0004en-F7 for qemu-devel@nongnu.org; Mon, 20 Apr 2020 09:32:52 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1587389571; 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=qKXUZmlru6pmYggmL/tjU9HOqkL962sW3qnltYaDw5U=; b=FHSF/nxSPHNu/klvUb3yLqN+rmXNrhHjW2rbPFXBxepie/h5Nb9eFYCksoY2sCqZGnHoRE JwDUfFXmISKhHkFA/z63Gdtd/uBLESR3a53cdGc9iiv91NtO7WWsnoTr8MUKsYLgYEDLNu 92qU+hWmznFxpbSjOsetV2oUSjtXkw0= 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-414-JdqBXKGvNvyj_4wADwKdxQ-1; Mon, 20 Apr 2020 09:32:45 -0400 X-MC-Unique: JdqBXKGvNvyj_4wADwKdxQ-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 32FC88024E5; Mon, 20 Apr 2020 13:32:44 +0000 (UTC) Received: from linux.fritz.box.com (ovpn-114-38.ams2.redhat.com [10.36.114.38]) by smtp.corp.redhat.com (Postfix) with ESMTP id 9E117116D9F; Mon, 20 Apr 2020 13:32:42 +0000 (UTC) From: Kevin Wolf To: qemu-block@nongnu.org Subject: [PATCH v4 6/9] file-posix: Support BDRV_REQ_ZERO_WRITE for truncate Date: Mon, 20 Apr 2020 15:32:11 +0200 Message-Id: <20200420133214.28921-7-kwolf@redhat.com> In-Reply-To: <20200420133214.28921-1-kwolf@redhat.com> References: <20200420133214.28921-1-kwolf@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=205.139.110.120; envelope-from=kwolf@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs1p.gnu.org: First seen = 2020/04/20 04:32:42 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] X-Received-From: 205.139.110.120 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: kwolf@redhat.com, vsementsov@virtuozzo.com, berto@igalia.com, qemu-devel@nongnu.org, mreitz@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" For regular files, we always get BDRV_REQ_ZERO_WRITE behaviour from the OS, so we can advertise the flag and just ignore it. Signed-off-by: Kevin Wolf --- block/file-posix.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/block/file-posix.c b/block/file-posix.c index 53f475ed61..1dca220a81 100644 --- a/block/file-posix.c +++ b/block/file-posix.c @@ -702,6 +702,10 @@ static int raw_open_common(BlockDriverState *bs, QDict *options, #endif bs->supported_zero_flags = BDRV_REQ_MAY_UNMAP | BDRV_REQ_NO_FALLBACK; + if (S_ISREG(st.st_mode)) { + /* When extending regular files, we get zeros from the OS */ + bs->supported_truncate_flags = BDRV_REQ_ZERO_WRITE; + } ret = 0; fail: if (filename && (bdrv_flags & BDRV_O_TEMPORARY)) {