From patchwork Fri Oct 23 18:36:47 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Blake X-Patchwork-Id: 1386943 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=GGuvoRDK; 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 4CHtRC5lS1z9sTK for ; Sat, 24 Oct 2020 05:43:35 +1100 (AEDT) Received: from localhost ([::1]:37920 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kW22H-00008A-NY for incoming@patchwork.ozlabs.org; Fri, 23 Oct 2020 14:43:33 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:50582) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kW1wQ-0001Eg-1q for qemu-devel@nongnu.org; Fri, 23 Oct 2020 14:37:30 -0400 Received: from us-smtp-delivery-124.mimecast.com ([63.128.21.124]:38511) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1kW1wO-0001ZO-AB for qemu-devel@nongnu.org; Fri, 23 Oct 2020 14:37:29 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1603478247; 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=PQKOiFY7z1Up2STIxZ1ZKXUu3eIWO5txVWaDYhaKISs=; b=GGuvoRDKp9TgmtY9cRfdXlLxJ0dhORozc7tWE2EBAmIuE8+UBooxHKoy/XX6QckMAoLJDO ybaFYWcJ9jSiDA4OneioD+RAnMCRIhaWfArvPZxaQVyXfxwX6nhB6c9C2daAuN6dNSQeQI njwHQtKyHdP1lFF77hfseAeEeRuYxcY= 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-372-jqraJq8JNlqMqJUMchZnaw-1; Fri, 23 Oct 2020 14:37:23 -0400 X-MC-Unique: jqraJq8JNlqMqJUMchZnaw-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 793DF804B7D; Fri, 23 Oct 2020 18:37:22 +0000 (UTC) Received: from blue.redhat.com (ovpn-113-7.phx2.redhat.com [10.3.113.7]) by smtp.corp.redhat.com (Postfix) with ESMTP id 6A85160BFA; Fri, 23 Oct 2020 18:37:15 +0000 (UTC) From: Eric Blake To: qemu-devel@nongnu.org Subject: [PATCH v5 07/12] nbd: Simplify qemu bitmap context name Date: Fri, 23 Oct 2020 13:36:47 -0500 Message-Id: <20201023183652.478921-8-eblake@redhat.com> In-Reply-To: <20201023183652.478921-1-eblake@redhat.com> References: <20201023183652.478921-1-eblake@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 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=63.128.21.124; envelope-from=eblake@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/10/23 02:46:25 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_H5=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: kwolf@redhat.com, vsementsov@virtuozzo.com, stefanha@redhat.com, qemu-block@nongnu.org, rjones@redhat.com 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 --- nbd/server.c | 19 +++++++++---------- 1 file changed, 9 insertions(+), 10 deletions(-) diff --git a/nbd/server.c b/nbd/server.c index 884ffa00f1bd..05a8154975a1 100644 --- a/nbd/server.c +++ b/nbd/server.c @@ -97,7 +97,6 @@ struct NBDExport { bool allocation_depth; BdrvDirtyBitmap *export_bitmap; - char *export_bitmap_context; }; static QTAILQ_HEAD(, NBDExport) exports = QTAILQ_HEAD_INITIALIZER(exports); @@ -882,14 +881,15 @@ 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; @@ -1025,8 +1025,11 @@ 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) { @@ -1599,9 +1602,6 @@ 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); } exp->allocation_depth = arg->allocation_depth; @@ -1681,7 +1681,6 @@ 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); } }