From patchwork Tue Oct 27 21:59:09 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Blake X-Patchwork-Id: 1388981 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=B8zl232K; dkim-atps=neutral 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 ozlabs.org (Postfix) with ESMTPS id 4CLQrV28g5z9sTD for ; Wed, 28 Oct 2020 09:10:50 +1100 (AEDT) Received: from localhost ([::1]:33538 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kXXB2-0001fA-9F for incoming@patchwork.ozlabs.org; Tue, 27 Oct 2020 18:10:48 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:54690) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kXX0I-0006nz-FA for qemu-devel@nongnu.org; Tue, 27 Oct 2020 17:59:43 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:30331) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1kXX0A-0000il-57 for qemu-devel@nongnu.org; Tue, 27 Oct 2020 17:59:40 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1603835971; 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=hU9/DUBR5rsxIqmLyl3jhSHK+aB3eCROq425MZMQck0=; b=B8zl232K5pLFHtl2bKFINIUzMGeWzFNgiOKa66OcPzNLn5oZqoA6TmAyyjPunIJNQH8jEn U3U8aEcz4rHoHd0LUE1Npc2OWBrruX8OmJZg1nYX2HNQcPHR0sijUqiJ8OU3CO3Z67kpD+ EMxYJDmQtxrqw2ZNwB7+0nszGuGbzO8= 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-325-jjav4__lOi25nmE3BD3BUg-1; Tue, 27 Oct 2020 17:59:29 -0400 X-MC-Unique: jjav4__lOi25nmE3BD3BUg-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id C46D31084D6D; Tue, 27 Oct 2020 21:59:27 +0000 (UTC) Received: from blue.redhat.com (ovpn-112-145.phx2.redhat.com [10.3.112.145]) by smtp.corp.redhat.com (Postfix) with ESMTP id 724BB10027AB; Tue, 27 Oct 2020 21:59:27 +0000 (UTC) From: Eric Blake To: qemu-devel@nongnu.org Subject: [PULL 07/12] nbd: Simplify qemu bitmap context name Date: Tue, 27 Oct 2020 16:59:09 -0500 Message-Id: <20201027215914.619460-8-eblake@redhat.com> In-Reply-To: <20201027215914.619460-1-eblake@redhat.com> References: <20201027215914.619460-1-eblake@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=eblake@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=216.205.24.124; envelope-from=eblake@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/10/27 01:06:06 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] 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_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no 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: Vladimir Sementsov-Ogievskiy , "open list:Network Block Dev..." Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Each dirty bitmap already knows its name; by reducing the scope of the places where we construct "qemu:dirty-bitmap:NAME" strings, tracking the name is more localized, and there are fewer per-export fields to worry about. This in turn will make it easier for an upcoming patch to export more than one bitmap at once. Signed-off-by: Eric Blake Reviewed-by: Vladimir Sementsov-Ogievskiy Message-Id: <20201027050556.269064-6-eblake@redhat.com> --- nbd/server.c | 19 +++++++++---------- 1 file changed, 9 insertions(+), 10 deletions(-) diff --git a/nbd/server.c b/nbd/server.c index 8d01662b4511..77fdecdf9dec 100644 --- a/nbd/server.c +++ b/nbd/server.c @@ -95,7 +95,6 @@ struct NBDExport { Notifier eject_notifier; BdrvDirtyBitmap *export_bitmap; - char *export_bitmap_context; }; static QTAILQ_HEAD(, NBDExport) exports = QTAILQ_HEAD_INITIALIZER(exports); @@ -871,14 +870,15 @@ static bool nbd_meta_qemu_query(NBDClient *client, NBDExportMetaContexts *meta, } if (nbd_strshift(&query, "dirty-bitmap:")) { + const char *bm_name; + trace_nbd_negotiate_meta_query_parse("dirty-bitmap:"); if (!meta->exp->export_bitmap) { trace_nbd_negotiate_meta_query_skip("no dirty-bitmap exported"); return true; } - if (nbd_meta_empty_or_pattern(client, - meta->exp->export_bitmap_context + - strlen("qemu:dirty-bitmap:"), query)) { + bm_name = bdrv_dirty_bitmap_name(meta->exp->export_bitmap); + if (nbd_meta_empty_or_pattern(client, bm_name, query)) { meta->bitmap = true; } return true; @@ -1004,8 +1004,11 @@ static int nbd_negotiate_meta_queries(NBDClient *client, } if (meta->bitmap) { - ret = nbd_negotiate_send_meta_context(client, - meta->exp->export_bitmap_context, + const char *bm_name = bdrv_dirty_bitmap_name(meta->exp->export_bitmap); + g_autofree char *context = g_strdup_printf("qemu:dirty-bitmap:%s", + bm_name); + + ret = nbd_negotiate_send_meta_context(client, context, NBD_META_ID_DIRTY_BITMAP, errp); if (ret < 0) { @@ -1576,9 +1579,6 @@ static int nbd_export_create(BlockExport *blk_exp, BlockExportOptions *exp_args, bdrv_dirty_bitmap_set_busy(bm, true); exp->export_bitmap = bm; assert(strlen(bitmap) <= BDRV_BITMAP_MAX_NAME_SIZE); - exp->export_bitmap_context = g_strdup_printf("qemu:dirty-bitmap:%s", - bitmap); - assert(strlen(exp->export_bitmap_context) < NBD_MAX_STRING_SIZE); } blk_add_aio_context_notifier(blk, blk_aio_attached, blk_aio_detach, exp); @@ -1656,7 +1656,6 @@ static void nbd_export_delete(BlockExport *blk_exp) if (exp->export_bitmap) { bdrv_dirty_bitmap_set_busy(exp->export_bitmap, false); - g_free(exp->export_bitmap_context); } }