From patchwork Wed Sep 6 12:04:57 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Hildenbrand X-Patchwork-Id: 13375625 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 A5F37EB8FB6 for ; Wed, 6 Sep 2023 12:07:24 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qdrIZ-0004LT-Qg; Wed, 06 Sep 2023 08:06:19 -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 1qdrHz-0003q8-KJ for qemu-devel@nongnu.org; Wed, 06 Sep 2023 08:05:49 -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 1qdrHr-0006mi-3a for qemu-devel@nongnu.org; Wed, 06 Sep 2023 08:05:42 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1694001929; 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=F1kA22JVHsglYk2MFAqsOM9Z7rc7IAtD66T3PwW5/fc=; b=K4F5oBAEvQAdMYWlJr0JZW/RyuL59E4UpOTH6jEu4BQTMeIwTkOppbJ8pueXupCE8PjkJC bTInIUmDambvc2STEaaA2MwWkDdZhNRVikLpxBWTbx0GkRst0T0UvaffyMKQ1hmzYvbYKo iPWNbK0GSIBHnVo6CY4vM/WCfB/inrg= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-260-7QnTYKoUODeMCll4GJSP4A-1; Wed, 06 Sep 2023 08:05:27 -0400 X-MC-Unique: 7QnTYKoUODeMCll4GJSP4A-1 Received: from smtp.corp.redhat.com (int-mx09.intmail.prod.int.rdu2.redhat.com [10.11.54.9]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 983921010429; Wed, 6 Sep 2023 12:05:26 +0000 (UTC) Received: from t14s.fritz.box (unknown [10.39.192.60]) by smtp.corp.redhat.com (Postfix) with ESMTP id 9E807493110; Wed, 6 Sep 2023 12:05:23 +0000 (UTC) From: David Hildenbrand To: qemu-devel@nongnu.org Cc: David Hildenbrand , Paolo Bonzini , Peter Xu , Igor Mammedov , Thiner Logoer , =?utf-8?q?Philippe_Mathieu-Daud?= =?utf-8?q?=C3=A9?= , =?utf-8?q?Daniel_P_=2E_Berrang?= =?utf-8?q?=C3=A9?= , Stefan Hajnoczi , Elena Ufimtseva , Jagannathan Raman , "Michael S. Tsirkin" , Ani Sinha , Xiao Guangrong , Daniel Henrique Barboza , Greg Kurz , Eric Blake , Markus Armbruster , Eduardo Habkost Subject: [PATCH v4 05/11] softmmu/physmem: Bail out early in ram_block_discard_range() with readonly files Date: Wed, 6 Sep 2023 14:04:57 +0200 Message-ID: <20230906120503.359863-6-david@redhat.com> In-Reply-To: <20230906120503.359863-1-david@redhat.com> References: <20230906120503.359863-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.9 Received-SPF: pass client-ip=170.10.133.124; envelope-from=david@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=ham 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 fallocate() will fail, let's print a nicer error message. Suggested-by: Peter Xu Reviewed-by: Peter Xu Signed-off-by: David Hildenbrand --- softmmu/physmem.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/softmmu/physmem.c b/softmmu/physmem.c index 88482bd32a..c520c2ac55 100644 --- a/softmmu/physmem.c +++ b/softmmu/physmem.c @@ -3481,6 +3481,16 @@ int ram_block_discard_range(RAMBlock *rb, uint64_t start, size_t length) * so a userfault will trigger. */ #ifdef CONFIG_FALLOCATE_PUNCH_HOLE + /* + * fallocate() will fail with readonly files. Let's print a + * proper error message. + */ + if (rb->flags & RAM_READONLY_FD) { + error_report("ram_block_discard_range: Discarding RAM" + " with readonly files is not supported"); + goto err; + + } /* * We'll discard data from the actual file, even though we only * have a MAP_PRIVATE mapping, possibly messing with other