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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9AC46C4332F for ; Mon, 11 Dec 2023 22:11:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345597AbjLKWLt (ORCPT ); Mon, 11 Dec 2023 17:11:49 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42568 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1345556AbjLKWLr (ORCPT ); Mon, 11 Dec 2023 17:11:47 -0500 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 32E9892 for ; Mon, 11 Dec 2023 14:11:54 -0800 (PST) Received: by smtp.kernel.org (Postfix) with ESMTPSA id AA37DC433C8; Mon, 11 Dec 2023 22:11:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1702332713; bh=p4mTC7IdUW3BAEiY7Fj43iN3lLzUWPhxoUHrJSl7/3k=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=E6FpIddV6KkFrsbZYmwd5978cZd8hXi0DUBNnP1fFB8t5jhRk2LSA6uAbSqbqWtDn hf3WEIxG8CtDMne3DwwDefG0cT1ge8VCDv+zUm9vcZ98ParJH8Ve67PiDDQd4y/Znb DbUOQ8Gj4XqkF/5PbwqKs4oufTkbEK2MdqY2MWwXwVKl7B2HDSUCNMDQVcq4/Pn0w5 mOddCznAR+Y4UMbGAU52Q+TPFGAGaveohOhAHP+OmFlksfQRWFk8SaCtSEE6wweAFI OYvzFD3VvCY6KvGu2nPB0SsMKVHAgN6FWJbS487buXrS7azRGQ+rxzR/0l+btJzY2l DO+RXJPyeKHyg== Date: Mon, 11 Dec 2023 14:11:52 -0800 From: Jaegeuk Kim To: Chao Yu Cc: linux-f2fs-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org Subject: Re: [PATCH 5/6] f2fs: fix to restrict condition of compress inode conversion Message-ID: References: <20231210113547.3412782-1-chao@kernel.org> <20231210113547.3412782-5-chao@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20231210113547.3412782-5-chao@kernel.org> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 12/10, Chao Yu wrote: > This patch adds i_size check during compress inode conversion in order > to avoid .page_mkwrite races w/ conversion. Which race condition do you see? > > Fixes: 4c8ff7095bef ("f2fs: support data compression") > Signed-off-by: Chao Yu > --- > fs/f2fs/f2fs.h | 8 +++++++- > fs/f2fs/file.c | 5 ++--- > 2 files changed, 9 insertions(+), 4 deletions(-) > > diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h > index 65294e3b0bef..c9b8a1953913 100644 > --- a/fs/f2fs/f2fs.h > +++ b/fs/f2fs/f2fs.h > @@ -4397,13 +4397,19 @@ static inline int set_compress_context(struct inode *inode) > #endif > } > > +static inline bool inode_has_data(struct inode *inode) > +{ > + return (S_ISREG(inode->i_mode) && > + (F2FS_HAS_BLOCKS(inode) || i_size_read(inode))); > +} > + > static inline bool f2fs_disable_compressed_file(struct inode *inode) > { > struct f2fs_inode_info *fi = F2FS_I(inode); > > if (!f2fs_compressed_file(inode)) > return true; > - if (S_ISREG(inode->i_mode) && F2FS_HAS_BLOCKS(inode)) > + if (inode_has_data(inode)) > return false; > > fi->i_flags &= ~F2FS_COMPR_FL; > diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c > index 1a3c29a9a6a0..8af4b29c3e1a 100644 > --- a/fs/f2fs/file.c > +++ b/fs/f2fs/file.c > @@ -1922,8 +1922,7 @@ static int f2fs_setflags_common(struct inode *inode, u32 iflags, u32 mask) > > f2fs_down_write(&F2FS_I(inode)->i_sem); > if (!f2fs_may_compress(inode) || > - (S_ISREG(inode->i_mode) && > - F2FS_HAS_BLOCKS(inode))) { > + inode_has_data(inode)) { > f2fs_up_write(&F2FS_I(inode)->i_sem); > return -EINVAL; > } > @@ -3996,7 +3995,7 @@ static int f2fs_ioc_set_compress_option(struct file *filp, unsigned long arg) > goto out; > } > > - if (F2FS_HAS_BLOCKS(inode)) { > + if (inode_has_data(inode)) { > ret = -EFBIG; > goto out; > } > -- > 2.40.1