From patchwork Mon Sep 4 14:36:36 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kevin Wolf X-Patchwork-Id: 1829641 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=Fsui+Ov5; dkim-atps=neutral Authentication-Results: legolas.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=patchwork.ozlabs.org) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by legolas.ozlabs.org (Postfix) with ESMTPS id 4RfWVC4XdRz1yhH for ; Tue, 5 Sep 2023 00:38:59 +1000 (AEST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qdAhP-0002EE-76; Mon, 04 Sep 2023 10:37:07 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qdAhN-0002CV-Rn for qemu-devel@nongnu.org; Mon, 04 Sep 2023 10:37:05 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qdAhI-0001k6-5n for qemu-devel@nongnu.org; Mon, 04 Sep 2023 10:37:05 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1693838218; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=vp42tg2077UKS8yn6t4e4+7kfeg7DlOQpeRnLhc8MKk=; b=Fsui+Ov5fqlESIa/Q+jHSwiRo7SzmXCSjKmr3IXZXZ36FxOYImA4udn45txPC1uwLmP+si jh9UhpG1VIFtmd0vwdzDolRHmUQFuIopPIghuzR0exrPioeAKQ7vDUQzYGO4vBa5L4Hzgp PwYfZD5HyAnoaqNn/jPzDZgGFZOJKHY= Received: from mimecast-mx02.redhat.com (mx-ext.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-286-xq6vZ4lRPQmz8EMb1qJgtg-1; Mon, 04 Sep 2023 10:36:55 -0400 X-MC-Unique: xq6vZ4lRPQmz8EMb1qJgtg-1 Received: from smtp.corp.redhat.com (int-mx10.intmail.prod.int.rdu2.redhat.com [10.11.54.10]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 203C93803906; Mon, 4 Sep 2023 14:36:55 +0000 (UTC) Received: from merkur.fritz.box (unknown [10.39.193.211]) by smtp.corp.redhat.com (Postfix) with ESMTP id 8445C400F5A; Mon, 4 Sep 2023 14:36:54 +0000 (UTC) From: Kevin Wolf To: qemu-block@nongnu.org Cc: kwolf@redhat.com, qemu-devel@nongnu.org Subject: [PULL 07/14] block: Be more verbose in create fallback Date: Mon, 4 Sep 2023 16:36:36 +0200 Message-ID: <20230904143643.259916-8-kwolf@redhat.com> In-Reply-To: <20230904143643.259916-1-kwolf@redhat.com> References: <20230904143643.259916-1-kwolf@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.10 Received-SPF: pass client-ip=170.10.133.124; envelope-from=kwolf@redhat.com; helo=us-smtp-delivery-124.mimecast.com 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: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org From: Hanna Czenczek For image creation code, we have central fallback code for protocols that do not support creating new images (like NBD or iscsi). So for them, you can only specify existing paths/exports that are overwritten to make clean new images. In such a case, if the given path cannot be opened (assuming a pre-existing image there), we print an error message that tries to describe what is going on: That with this protocol, you cannot create new images, but only overwrite existing ones; and the given path could not be opened as a pre-existing image. However, the current message is confusing, because it does not say that the protocol in question does not support creating new images, but instead that "image creation" is unsupported. This can be interpreted to mean that `qemu-img create` will not work in principle, which is not true. Be more verbose for clarity. Buglink: https://bugzilla.redhat.com/show_bug.cgi?id=2217204 Signed-off-by: Hanna Czenczek Message-ID: <20230720140024.46836-1-hreitz@redhat.com> Reviewed-by: Eric Blake Reviewed-by: Kevin Wolf Signed-off-by: Kevin Wolf --- block.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/block.c b/block.c index b79b1ce7fe..1a5cb554a8 100644 --- a/block.c +++ b/block.c @@ -661,8 +661,10 @@ int coroutine_fn bdrv_co_create_opts_simple(BlockDriver *drv, blk = blk_co_new_open(filename, NULL, options, BDRV_O_RDWR | BDRV_O_RESIZE, errp); if (!blk) { - error_prepend(errp, "Protocol driver '%s' does not support image " - "creation, and opening the image failed: ", + error_prepend(errp, "Protocol driver '%s' does not support creating " + "new images, so an existing image must be selected as " + "the target; however, opening the given target as an " + "existing image failed: ", drv->format_name); return -EINVAL; }