From nobody Mon Feb 9 07:55:37 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; 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 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1567718466; cv=none; d=zoho.com; s=zohoarc; b=i8NkefGMEI/GQL9O/n6hW4Ly59QAJncKIN8e0HEcB1gm/l4nmX0AqG5gz3XzBkYOAVcFLuCZNbfxLdj65/rjyQZ/YgQeKRErbNVNv+WknBb0ZBHpaut3RsqKvXjNAl/xZwdRvB3hp3KWrpdvmT8DeLn2bpvEDCIEvRgGIN57dv4= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zoho.com; s=zohoarc; t=1567718466; h=Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To:ARC-Authentication-Results; bh=Mam+ynrp5CD4E57res0ZW17yctNBXF6lkPIPwupxJkk=; b=SkClvbWDrLCB8UAdfagsSoSYRiyjMqvuULfm9LfK4xLssN/rPwGKZ/R/QhGdldt/yd7a1W51vI+SB/UloYpsshJjnzKH7R0xkDhaDN/4Vb3aiRulVY/Z8YKJwUgGyrlEVrIDpoI/VJ6bPiSosiU/opldVUpIk0jSV5VHrDrGptU= ARC-Authentication-Results: i=1; mx.zoho.com; spf=pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail header.from= (p=none dis=none) header.from= Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1567718466223472.3735058344872; Thu, 5 Sep 2019 14:21:06 -0700 (PDT) Received: from localhost ([::1]:49970 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1i5zBh-0006ds-70 for importer@patchew.org; Thu, 05 Sep 2019 17:21:05 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:36433) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1i5z6q-00027Q-SA for qemu-devel@nongnu.org; Thu, 05 Sep 2019 17:16:05 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1i5z6p-0002RN-P7 for qemu-devel@nongnu.org; Thu, 05 Sep 2019 17:16:04 -0400 Received: from mx1.redhat.com ([209.132.183.28]:57446) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1i5z6m-0002PC-PS; Thu, 05 Sep 2019 17:16:00 -0400 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 0DB91883820; Thu, 5 Sep 2019 21:16:00 +0000 (UTC) Received: from blue.redhat.com (ovpn-116-234.phx2.redhat.com [10.3.116.234]) by smtp.corp.redhat.com (Postfix) with ESMTP id 8AAC46061E; Thu, 5 Sep 2019 21:15:59 +0000 (UTC) From: Eric Blake To: qemu-devel@nongnu.org Date: Thu, 5 Sep 2019 16:15:22 -0500 Message-Id: <20190905211522.2824-10-eblake@redhat.com> In-Reply-To: <20190905211522.2824-1-eblake@redhat.com> References: <20190905211522.2824-1-eblake@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.6.2 (mx1.redhat.com [10.5.110.69]); Thu, 05 Sep 2019 21:16:00 +0000 (UTC) Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PULL v2 9/9] nbd: Implement server use of NBD FAST_ZERO 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: Kevin Wolf , Vladimir Sementsov-Ogievskiy , "open list:Network Block Dev..." , Max Reitz Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Type: text/plain; charset="utf-8" The server side is fairly straightforward: we can always advertise support for detection of fast zero, and implement it by mapping the request to the block layer BDRV_REQ_NO_FALLBACK. Signed-off-by: Eric Blake Message-Id: <20190823143726.27062-5-eblake@redhat.com> Reviewed-by: Vladimir Sementsov-Ogievskiy [eblake: update iotests 223, 233] --- nbd/server.c | 8 ++++++-- tests/qemu-iotests/223.out | 2 +- tests/qemu-iotests/233.out | 2 +- 3 files changed, 8 insertions(+), 4 deletions(-) diff --git a/nbd/server.c b/nbd/server.c index 4992148de1c4..28c3c8be854c 100644 --- a/nbd/server.c +++ b/nbd/server.c @@ -1513,7 +1513,8 @@ NBDExport *nbd_export_new(BlockDriverState *bs, uint6= 4_t dev_offset, exp->nbdflags |=3D NBD_FLAG_CAN_MULTI_CONN; } } else { - exp->nbdflags |=3D NBD_FLAG_SEND_TRIM | NBD_FLAG_SEND_WRITE_ZEROES; + exp->nbdflags |=3D (NBD_FLAG_SEND_TRIM | NBD_FLAG_SEND_WRITE_ZEROE= S | + NBD_FLAG_SEND_FAST_ZERO); } assert(size <=3D INT64_MAX - dev_offset); exp->size =3D QEMU_ALIGN_DOWN(size, BDRV_SECTOR_SIZE); @@ -2166,7 +2167,7 @@ static int nbd_co_receive_request(NBDRequestData *req= , NBDRequest *request, if (request->type =3D=3D NBD_CMD_READ && client->structured_reply) { valid_flags |=3D NBD_CMD_FLAG_DF; } else if (request->type =3D=3D NBD_CMD_WRITE_ZEROES) { - valid_flags |=3D NBD_CMD_FLAG_NO_HOLE; + valid_flags |=3D NBD_CMD_FLAG_NO_HOLE | NBD_CMD_FLAG_FAST_ZERO; } else if (request->type =3D=3D NBD_CMD_BLOCK_STATUS) { valid_flags |=3D NBD_CMD_FLAG_REQ_ONE; } @@ -2305,6 +2306,9 @@ static coroutine_fn int nbd_handle_request(NBDClient = *client, if (!(request->flags & NBD_CMD_FLAG_NO_HOLE)) { flags |=3D BDRV_REQ_MAY_UNMAP; } + if (request->flags & NBD_CMD_FLAG_FAST_ZERO) { + flags |=3D BDRV_REQ_NO_FALLBACK; + } ret =3D blk_pwrite_zeroes(exp->blk, request->from + exp->dev_offse= t, request->len, flags); return nbd_send_generic_reply(client, request->handle, ret, diff --git a/tests/qemu-iotests/223.out b/tests/qemu-iotests/223.out index 2db0dc991a27..5d00398c11cb 100644 --- a/tests/qemu-iotests/223.out +++ b/tests/qemu-iotests/223.out @@ -49,7 +49,7 @@ exports available: 2 qemu:dirty-bitmap:b export: 'n2' size: 4194304 - flags: 0x4ed ( flush fua trim zeroes df cache ) + flags: 0xced ( flush fua trim zeroes df cache fast-zero ) min block: 1 opt block: 4096 max block: 33554432 diff --git a/tests/qemu-iotests/233.out b/tests/qemu-iotests/233.out index a3ecc4eb5ccf..24321efa113b 100644 --- a/tests/qemu-iotests/233.out +++ b/tests/qemu-iotests/233.out @@ -37,7 +37,7 @@ disk size: unavailable exports available: 1 export: '' size: 67108864 - flags: 0x4ed ( flush fua trim zeroes df cache ) + flags: 0xced ( flush fua trim zeroes df cache fast-zero ) min block: 1 opt block: 4096 max block: 33554432 --=20 2.21.0