From patchwork Mon Feb 10 16:10:30 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kevin Wolf X-Patchwork-Id: 13968192 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org 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 smtp.lore.kernel.org (Postfix) with ESMTPS id DCE74C02198 for ; Mon, 10 Feb 2025 16:18:38 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1thWO3-0006mz-2L; Mon, 10 Feb 2025 11:11:55 -0500 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 1thWNs-0006fz-0S for qemu-devel@nongnu.org; Mon, 10 Feb 2025 11:11:44 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1thWNq-000185-4W for qemu-devel@nongnu.org; Mon, 10 Feb 2025 11:11:43 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1739203901; 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=Bb+kNxOUvZU5W6NOwCR13+8JSiVu8xg9TQlqIb8lfms=; b=QqwMRDssU6BfAyyzOqsHetu+WdnIffFJeWR9CnOM+i6JNhmygRiuQHQEKt7yYEH6zrxLhr W4yUEzxDYnqIGGEqI9DGnAr3zfqFfZ+vSTQLVzqYZmUpWrNoM41ZxIIKikeVYfuS5NUKDy KZKOpho1yRvmx3Wa1JgBPmy2S7gmEzk= Received: from mx-prod-mc-05.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-543-o31S1-iyOdaUDyX8DOASdA-1; Mon, 10 Feb 2025 11:11:31 -0500 X-MC-Unique: o31S1-iyOdaUDyX8DOASdA-1 X-Mimecast-MFC-AGG-ID: o31S1-iyOdaUDyX8DOASdA Received: from mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.17]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id B55201956088; Mon, 10 Feb 2025 16:11:29 +0000 (UTC) Received: from merkur.fritz.box (unknown [10.45.225.156]) by mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 4FD4A195608D; Mon, 10 Feb 2025 16:11:28 +0000 (UTC) From: Kevin Wolf To: qemu-block@nongnu.org Cc: kwolf@redhat.com, qemu-devel@nongnu.org Subject: [PULL 21/25] nbd/server: Support inactive nodes Date: Mon, 10 Feb 2025 17:10:30 +0100 Message-ID: <20250210161034.76494-22-kwolf@redhat.com> In-Reply-To: <20250210161034.76494-1-kwolf@redhat.com> References: <20250210161034.76494-1-kwolf@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.17 Received-SPF: pass client-ip=170.10.129.124; envelope-from=kwolf@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -34 X-Spam_score: -3.5 X-Spam_bar: --- X-Spam_report: (-3.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1.388, 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, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=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+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org In order to support running an NBD export on inactive nodes, we must make sure to return errors for any operations that aren't allowed on inactive nodes. Reads are the only operation we know we need for inactive images, so to err on the side of caution, return errors for everything else, even if some operations could possibly be okay. Signed-off-by: Kevin Wolf Acked-by: Fabiano Rosas Message-ID: <20250204211407.381505-14-kwolf@redhat.com> Reviewed-by: Stefan Hajnoczi Reviewed-by: Eric Blake Signed-off-by: Kevin Wolf --- nbd/server.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/nbd/server.c b/nbd/server.c index f64e47270c..2076fb2666 100644 --- a/nbd/server.c +++ b/nbd/server.c @@ -2026,6 +2026,7 @@ static void nbd_export_delete(BlockExport *blk_exp) const BlockExportDriver blk_exp_nbd = { .type = BLOCK_EXPORT_TYPE_NBD, .instance_size = sizeof(NBDExport), + .supports_inactive = true, .create = nbd_export_create, .delete = nbd_export_delete, .request_shutdown = nbd_export_request_shutdown, @@ -2920,6 +2921,22 @@ static coroutine_fn int nbd_handle_request(NBDClient *client, NBDExport *exp = client->exp; char *msg; size_t i; + bool inactive; + + WITH_GRAPH_RDLOCK_GUARD() { + inactive = bdrv_is_inactive(blk_bs(exp->common.blk)); + if (inactive) { + switch (request->type) { + case NBD_CMD_READ: + /* These commands are allowed on inactive nodes */ + break; + default: + /* Return an error for the rest */ + return nbd_send_generic_reply(client, request, -EPERM, + "export is inactive", errp); + } + } + } switch (request->type) { case NBD_CMD_CACHE: