From mboxrd@z Thu Jan 1 00:00:00 1970 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 593B7C369D9 for ; Wed, 30 Apr 2025 15:38:22 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1uA9VB-0000Jl-R9; Wed, 30 Apr 2025 11:37:37 -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 1uA9VA-0000Im-1e for qemu-devel@nongnu.org; Wed, 30 Apr 2025 11:37:36 -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 1uA9V8-0008GT-2K for qemu-devel@nongnu.org; Wed, 30 Apr 2025 11:37:35 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1746027453; 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: in-reply-to:in-reply-to:references:references; bh=lNm4LuuHUoiMVGPVf5dwoL7YNxyrplPdsmMXg1JSi3A=; b=SRNNu+DdEKiwX7Ac1OAxYyn7orF0uaCefYA+BUa783MTQBm5KLaQDtbtTaPlv/S6uUU1+k e/KTlNX7Mg6RE0yXUOQHyGnGmPcHU895T+owQObBtqzmW78JJaV46DH6hhTioLF0OTC9GB cOwfZMQtJ4eER6FFImrmO6fV8HzNDLI= Received: from mx-prod-mc-02.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-648-HG-zRvc7MGKzErlg8yMKww-1; Wed, 30 Apr 2025 11:37:29 -0400 X-MC-Unique: HG-zRvc7MGKzErlg8yMKww-1 X-Mimecast-MFC-AGG-ID: HG-zRvc7MGKzErlg8yMKww_1746027448 Received: from mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.111]) (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-02.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id D791B1956087; Wed, 30 Apr 2025 15:37:27 +0000 (UTC) Received: from localhost (unknown [10.2.17.53]) by mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 41ED018001D5; Wed, 30 Apr 2025 15:37:27 +0000 (UTC) Date: Wed, 30 Apr 2025 11:37:26 -0400 From: Stefan Hajnoczi To: Kevin Wolf Cc: qemu-block@nongnu.org, qemu-devel@nongnu.org Subject: Re: [PATCH] file-posix: Fix crash on discard_granularity == 0 Message-ID: <20250430153726.GA56296@fedora> References: <20250429155654.102735-1-kwolf@redhat.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="gopXaFSlEVlEz7fJ" Content-Disposition: inline In-Reply-To: <20250429155654.102735-1-kwolf@redhat.com> X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.111 Received-SPF: pass client-ip=170.10.133.124; envelope-from=stefanha@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -25 X-Spam_score: -2.6 X-Spam_bar: -- X-Spam_report: (-2.6 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.483, 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 --gopXaFSlEVlEz7fJ Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, Apr 29, 2025 at 05:56:54PM +0200, Kevin Wolf wrote: > Block devices that don't support discard have a discard_granularity of > 0. Currently, this results in a division by zero when we try to make > sure that it's a multiple of request_alignment. Only try to update > bs->bl.pdiscard_alignment when we got a non-zero discard_granularity > from sysfs. >=20 > Fixes: f605796aae4 ('file-posix: probe discard alignment on Linux block d= evices') > Signed-off-by: Kevin Wolf > --- > block/file-posix.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) Reviewed-by: Stefan Hajnoczi --gopXaFSlEVlEz7fJ Content-Type: application/pgp-signature; name=signature.asc -----BEGIN PGP SIGNATURE----- iQEzBAEBCgAdFiEEhpWov9P5fNqsNXdanKSrs4Grc8gFAmgSQ7UACgkQnKSrs4Gr c8g6aQf/e+N7VGruArHWWlEFuTbTytL9XxBworD1+bdROI6stgactxxoxrrQu7ms oXnQfg3fDV46vOdPw4pFbKIJvz9/0Hmy4DyCeEH2Enf+oQmsvlnLhBkwTmOOx9oO IK1WuFsB1wg6gdM/rtCMb7MllSTvKJ/ycG5LP7LggrBhaDG8bbzAZZok59aqDP+K qPwPY1m8aSFzCCzw5cB1exjiqAk1YB9xGrxcGQ0GBE+WnyXbqSi8VrUlcl5jVejD H/88tGy0LBGT8LvS1/9ODJaaihEgUa5XYriNIvShz/uNcFiAQDopcokjw71bLfqu QVxvOT4JBhvuDd9k16hfz5RrmstJjQ== =2kiQ -----END PGP SIGNATURE----- --gopXaFSlEVlEz7fJ--