From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.kernel.org ([198.145.29.99]:58390 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1422749AbeE1LKU (ORCPT ); Mon, 28 May 2018 07:10:20 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Joakim Tjernlund , Eric Sandeen , Theodore Tso , Jan Kara , Sasha Levin Subject: [PATCH 4.16 140/272] ext4: dont complain about incorrect features when probing Date: Mon, 28 May 2018 12:02:53 +0200 Message-Id: <20180528100252.805459949@linuxfoundation.org> In-Reply-To: <20180528100240.256525891@linuxfoundation.org> References: <20180528100240.256525891@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: stable-owner@vger.kernel.org List-ID: 4.16-stable review patch. If anyone has any objections, please let me know. ------------------ From: Eric Sandeen [ Upstream commit 0d9366d67bcf066b028e57d09c9a86ce879bcc28 ] If mount is auto-probing for filesystem type, it will try various filesystems in order, with the MS_SILENT flag set. We get that flag as the silent arg to ext4_fill_super. If we're probing (silent==1) then don't complain about feature incompatibilities that are found if it looks like it's actually a different valid extN type - failed probes should be silent in this case. If the on-disk features are unknown even to ext4, then complain. Reported-by: Joakim Tjernlund Tested-by: Joakim Tjernlund Signed-off-by: Eric Sandeen Signed-off-by: Theodore Ts'o Reviewed-by: Jan Kara Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- fs/ext4/super.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -3663,6 +3663,12 @@ static int ext4_fill_super(struct super_ ext4_msg(sb, KERN_INFO, "mounting ext2 file system " "using the ext4 subsystem"); else { + /* + * If we're probing be silent, if this looks like + * it's actually an ext[34] filesystem. + */ + if (silent && ext4_feature_set_ok(sb, sb_rdonly(sb))) + goto failed_mount; ext4_msg(sb, KERN_ERR, "couldn't mount as ext2 due " "to feature incompatibilities"); goto failed_mount; @@ -3674,6 +3680,12 @@ static int ext4_fill_super(struct super_ ext4_msg(sb, KERN_INFO, "mounting ext3 file system " "using the ext4 subsystem"); else { + /* + * If we're probing be silent, if this looks like + * it's actually an ext4 filesystem. + */ + if (silent && ext4_feature_set_ok(sb, sb_rdonly(sb))) + goto failed_mount; ext4_msg(sb, KERN_ERR, "couldn't mount as ext3 due " "to feature incompatibilities"); goto failed_mount;