From patchwork Fri May 8 12:41:29 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kevin Wolf X-Patchwork-Id: 283166 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=-6.9 required=3.0 tests=DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, 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 46D34C38A2A for ; Fri, 8 May 2020 12:51:39 +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 1516224966 for ; Fri, 8 May 2020 12:51:39 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="bSn2t/hY" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1516224966 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]:59594 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jX2Ta-0006sx-7g for qemu-devel@archiver.kernel.org; Fri, 08 May 2020 08:51:38 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:49448) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jX2Kd-0000Hd-Dg for qemu-devel@nongnu.org; Fri, 08 May 2020 08:42:23 -0400 Received: from us-smtp-delivery-1.mimecast.com ([205.139.110.120]:26360 helo=us-smtp-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1jX2Kb-00007f-Ej for qemu-devel@nongnu.org; Fri, 08 May 2020 08:42:22 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1588941739; 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=7HQylRIVQfJwZEZ7Qe8VlAfHLYkLF2X07hXACpQ9d+A=; b=bSn2t/hYHDDGoiNgJ12HZRA/7yG56v41+ZqQjSPcll/P7uPm88JM1fGfPiOp5Z6AxLfGMO wsndvANpNMgrQcWrRyyQ802LFeyaqkeNvRdwKafmWHTwCgAzRkzBBiT2RG3cOjPvF6rNqJ I3+dBewILS6eEfB7XPW6GajZ6S9sdCc= 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-166-XLpiziUSPbe5vuvyDP5TXw-1; Fri, 08 May 2020 08:42:14 -0400 X-MC-Unique: XLpiziUSPbe5vuvyDP5TXw-1 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 mimecast-mx01.redhat.com (Postfix) with ESMTPS id BF3BA107ACF5; Fri, 8 May 2020 12:42:13 +0000 (UTC) Received: from linux.fritz.box.com (ovpn-113-190.ams2.redhat.com [10.36.113.190]) by smtp.corp.redhat.com (Postfix) with ESMTP id C2B2219167; Fri, 8 May 2020 12:42:12 +0000 (UTC) From: Kevin Wolf To: qemu-block@nongnu.org Subject: [PULL 24/30] nfs: Support BDRV_REQ_ZERO_WRITE for truncate Date: Fri, 8 May 2020 14:41:29 +0200 Message-Id: <20200508124135.252565-25-kwolf@redhat.com> In-Reply-To: <20200508124135.252565-1-kwolf@redhat.com> References: <20200508124135.252565-1-kwolf@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 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 eggs.gnu.org: First seen = 2020/05/08 02:25:09 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_PASS=-0.001 autolearn=_AUTOLEARN X-Spam_action: no action 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, peter.maydell@linaro.org, qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: Eric Blake Our .bdrv_has_zero_init_truncate returns 1 if we detect that the OS always 0-fills; we can use that same knowledge to implement BDRV_REQ_ZERO_WRITE by ignoring it when the OS gives it to us for free. Signed-off-by: Eric Blake Message-Id: <20200428202905.770727-4-eblake@redhat.com> Signed-off-by: Kevin Wolf --- block/nfs.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/block/nfs.c b/block/nfs.c index 385d756e1d..76daa7c9f6 100644 --- a/block/nfs.c +++ b/block/nfs.c @@ -620,6 +620,9 @@ static int nfs_file_open(BlockDriverState *bs, QDict *options, int flags, } bs->total_sectors = ret; + if (client->has_zero_init) { + bs->supported_truncate_flags = BDRV_REQ_ZERO_WRITE; + } return 0; }