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 X-Spam-Level: X-Spam-Status: No, score=-6.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 24AE7C0018C for ; Mon, 7 Dec 2020 20:37:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CCD41238A0 for ; Mon, 7 Dec 2020 20:37:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726620AbgLGUhq (ORCPT ); Mon, 7 Dec 2020 15:37:46 -0500 Received: from mail.kernel.org ([198.145.29.99]:47880 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725933AbgLGUhq (ORCPT ); Mon, 7 Dec 2020 15:37:46 -0500 Date: Mon, 7 Dec 2020 12:37:03 -0800 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1607373425; bh=0D2ooDXaNUKeLHALauHhhHNJgFgomBWbSNKb8afQF9Y=; h=From:To:Cc:Subject:References:In-Reply-To:From; b=GHWaYwIdIq/2b1iiexqNp0nTo6SXKpcxAPzqgOFZi9HcabPKpSqHTjZCOeDNVFuxu WEwMAsLHSPmv48f8Ev6/vV91rsLTrMAZQVwL4N3La/Vgt8vYrwI0cIkvdN9CKivntm 1PDs+mICJYJXQzzAVJW1H4zZD9aPNP1MliCB8jcRl/fTehGnUAbiXkIoLP0ps+grn9 z+ilu2jMfrWIxlzAiV81gXXC/0VpXQUOAhzLxGql/ccrd1Thof74vT7f0o5Ed6dBb0 9cOWZh7j1zSvct+E7yEESm8X/WcU7pKNqBH8LOrA+SfTNi7N4ypcJ2POhdX+cYMsIg RLyrF745SUlGg== From: Eric Biggers To: Chao Yu Cc: jaegeuk@kernel.org, linux-kernel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net Subject: Re: [f2fs-dev] [PATCH v3] f2fs: compress: support chksum Message-ID: References: <20201126103209.67985-1-yuchao0@huawei.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20201126103209.67985-1-yuchao0@huawei.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Nov 26, 2020 at 06:32:09PM +0800, Chao Yu wrote: > + if (!ret && fi->i_compress_flag & 1 << COMPRESS_CHKSUM) { This really could use some parentheses. People shouldn't have to look up a C operator precedence table to understand the code. > + u32 provided = le32_to_cpu(dic->cbuf->chksum); > + u32 calculated = f2fs_crc32(sbi, dic->cbuf->cdata, dic->clen); > + > + if (provided != calculated) { > + if (!is_inode_flag_set(dic->inode, FI_COMPRESS_CORRUPT)) { > + set_inode_flag(dic->inode, FI_COMPRESS_CORRUPT); > + printk_ratelimited( > + "%sF2FS-fs (%s): checksum invalid, nid = %lu, %x vs %x", > + KERN_INFO, sbi->sb->s_id, dic->inode->i_ino, > + provided, calculated); > + } > + set_sbi_flag(sbi, SBI_NEED_FSCK); > + WARN_ON_ONCE(1); WARN, WARN_ON_ONCE, BUG, BUG_ON, etc. are only for kernel bugs, not for invalid inputs from disk or userspace. There is already a log message printed just above, so it seems this WARN_ON_ONCE should just be removed. - Eric