From patchwork Tue Apr 26 08:21:21 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 567999 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 17B03C433EF for ; Tue, 26 Apr 2022 08:33:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241421AbiDZIgd (ORCPT ); Tue, 26 Apr 2022 04:36:33 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33962 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1345539AbiDZIen (ORCPT ); Tue, 26 Apr 2022 04:34:43 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7FC3D78FE9; Tue, 26 Apr 2022 01:27:38 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 167CC617AE; Tue, 26 Apr 2022 08:27:38 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1CA9AC385A4; Tue, 26 Apr 2022 08:27:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1650961657; bh=rXwXAidvJq3nMv+8q5ENQBIe/PH5KIoFhtL2h7Zp24k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=nrS9RghNiCzeqdSiD3mZOwVeJgb+kSRzSoFYLUdqOrEzJm8YS3u1mNl1uhqBC/qEs Pfe2tdLfRsN12sSTrPhFifbfqbgLk1thM9GIut+sDgVjy6QdQoIXEK9O3NWt3FLi2Y ROfBeoB5O8X5272acS3i9SEtuAUfxnD3s9PJZWgY= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Theodore Tso , stable@kernel.org Subject: [PATCH 4.19 41/53] ext4: fix overhead calculation to account for the reserved gdt blocks Date: Tue, 26 Apr 2022 10:21:21 +0200 Message-Id: <20220426081736.852399741@linuxfoundation.org> X-Mailer: git-send-email 2.36.0 In-Reply-To: <20220426081735.651926456@linuxfoundation.org> References: <20220426081735.651926456@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Theodore Ts'o commit 10b01ee92df52c8d7200afead4d5e5f55a5c58b1 upstream. The kernel calculation was underestimating the overhead by not taking into account the reserved gdt blocks. With this change, the overhead calculated by the kernel matches the overhead calculation in mke2fs. Signed-off-by: Theodore Ts'o Cc: stable@kernel.org Signed-off-by: Greg Kroah-Hartman --- fs/ext4/super.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -3440,9 +3440,11 @@ static int count_overhead(struct super_b ext4_fsblk_t first_block, last_block, b; ext4_group_t i, ngroups = ext4_get_groups_count(sb); int s, j, count = 0; + int has_super = ext4_bg_has_super(sb, grp); if (!ext4_has_feature_bigalloc(sb)) - return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) + + return (has_super + ext4_bg_num_gdb(sb, grp) + + (has_super ? le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) : 0) + sbi->s_itb_per_group + 2); first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +