From patchwork Thu Jun 30 11:08:19 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peter Lieven X-Patchwork-Id: 9207239 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 59FBA6075F for ; Thu, 30 Jun 2016 11:08:57 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4AC8C28615 for ; Thu, 30 Jun 2016 11:08:57 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 3F31F28661; Thu, 30 Jun 2016 11:08:57 +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 BEF6928615 for ; Thu, 30 Jun 2016 11:08:56 +0000 (UTC) Received: from localhost ([::1]:48486 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bIZq3-00006K-TC for patchwork-qemu-devel@patchwork.kernel.org; Thu, 30 Jun 2016 07:08:55 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:44076) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bIZpg-0008WD-Rg for qemu-devel@nongnu.org; Thu, 30 Jun 2016 07:08:33 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1bIZpb-0004k5-Sb for qemu-devel@nongnu.org; Thu, 30 Jun 2016 07:08:31 -0400 Received: from mx-v6.kamp.de ([2a02:248:0:51::16]:53336 helo=mx01.kamp.de) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bIZpb-0004j4-JM for qemu-devel@nongnu.org; Thu, 30 Jun 2016 07:08:27 -0400 Received: (qmail 3606 invoked by uid 89); 30 Jun 2016 11:08:26 -0000 Received: from [195.62.97.28] by client-16-kamp (envelope-from , uid 89) with qmail-scanner-2010/03/19-MF (clamdscan: 0.99.2/21816. hbedv: 8.3.40.44/7.12.99.34. avast: 1.2.2/16063001. spamassassin: 3.4.1. Clear:RC:1(195.62.97.28):. Processed in 0.11052 secs); 30 Jun 2016 11:08:26 -0000 Received: from smtp.kamp.de (HELO submission.kamp.de) ([195.62.97.28]) by mx01.kamp.de with ESMTPS (DHE-RSA-AES256-GCM-SHA384 encrypted); 30 Jun 2016 11:08:25 -0000 X-GL_Whitelist: yes Received: (qmail 6595 invoked from network); 30 Jun 2016 11:08:25 -0000 Received: from lieven-pc.kamp-intra.net (HELO lieven-pc) (relay@kamp.de@::ffff:172.21.12.60) by submission.kamp.de with ESMTPS (DHE-RSA-AES256-GCM-SHA384 encrypted) ESMTPA; 30 Jun 2016 11:08:25 -0000 Received: by lieven-pc (Postfix, from userid 1000) id 223CA20834; Thu, 30 Jun 2016 13:08:21 +0200 (CEST) From: Peter Lieven To: qemu-block@nongnu.org Date: Thu, 30 Jun 2016 13:08:19 +0200 Message-Id: <1467284899-22575-1-git-send-email-pl@kamp.de> X-Mailer: git-send-email 1.9.1 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 2a02:248:0:51::16 Subject: [Qemu-devel] [PATCH] block/iscsi: precache the allocation status of a target 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, famz@redhat.com, Peter Lieven , qemu-devel@nongnu.org, mreitz@redhat.com, ronniesahlberg@gmail.com, pbonzini@redhat.com Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP this fills up the allocationmap at iscsi_open. This helps to reduce the number of get_block_status requests during runtime significantly. Signed-off-by: Peter Lieven --- block/iscsi.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/block/iscsi.c b/block/iscsi.c index 0cdcedb..04fb0a3 100644 --- a/block/iscsi.c +++ b/block/iscsi.c @@ -1774,6 +1774,22 @@ static int iscsi_open(BlockDriverState *bs, QDict *options, int flags, iscsilun->block_size) >> BDRV_SECTOR_BITS; if (iscsilun->lbprz) { ret = iscsi_allocmap_init(iscsilun, bs->open_flags); + if (ret == 0) { + unsigned int max_reqs = 64; + int64_t sector_num = 0; + while (max_reqs-- && sector_num < bs->total_sectors) { + int n; + BlockDriverState *file; + ret = bdrv_get_block_status(bs, sector_num, + BDRV_REQUEST_MAX_SECTORS, + &n, &file); + if (ret < 0) { + break; + } + sector_num += n; + ret = 0; + } + } } }