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=-8.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=ham 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 DFD3EC433FF for ; Tue, 30 Jul 2019 23:18:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B1FCA206E0 for ; Tue, 30 Jul 2019 23:18:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1564528734; bh=6xmGYc6TH8AweXfIvI1TfQpeRJZVleWQJq3+Osoyc+w=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=V7Ftv28SleSuLgW7IoIW39rQm+v9B2IaCCg5wr3FI0lSc9ajcdlkcyQ3Tl3Lw6Eio dxyPwFguSYbe8usOgiBXx57hsQzcmA8w8LB/iBOQ6MUnAyYT/TKTjdslkYe9pd6Cgg XdzQDtfhaEm2YmxjcgGUXeRKJ1dsKii8EzuY+Y+A= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727747AbfG3XSw (ORCPT ); Tue, 30 Jul 2019 19:18:52 -0400 Received: from mail.kernel.org ([198.145.29.99]:37912 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726145AbfG3XSw (ORCPT ); Tue, 30 Jul 2019 19:18:52 -0400 Received: from localhost (unknown [104.132.0.81]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 37328206A2; Tue, 30 Jul 2019 23:18:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1564528731; bh=6xmGYc6TH8AweXfIvI1TfQpeRJZVleWQJq3+Osoyc+w=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=awpi5r6cyEwrlHtECjfeR/LWADesJ0wZFr0r3vwlfULUQAC9B6AZyKXxl9NTmJbXA 2Faz2LxzoKOmEUVyilxVvmLFHv5kdvAZVeJANlt5tzrBVjcpTDX4Q0xh+sHYsMF5MN z6uB82Zhf4fvV361NBWaKCvFUl8Xbjzmj63WwTbw= Date: Tue, 30 Jul 2019 16:18:50 -0700 From: Jaegeuk Kim To: Chao Yu Cc: linux-f2fs-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org, Chao Yu Subject: Re: [PATCH v3 RESEND] f2fs: introduce sb.required_features to store incompatible features Message-ID: <20190730231850.GA7097@jaegeuk-macbookpro.roam.corp.google.com> References: <20190729150351.12223-1-chao@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190729150351.12223-1-chao@kernel.org> User-Agent: Mutt/1.8.2 (2017-04-18) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 07/29, Chao Yu wrote: > From: Chao Yu > > Later after this patch was merged, all new incompatible feature's > bit should be added into sb.required_features field, and define new > feature function with F2FS_INCOMPAT_FEATURE_FUNCS() macro. > > Then during mount, we will do sanity check with enabled features in > image, if there are features in sb.required_features that kernel can > not recognize, just fail the mount. > > Signed-off-by: Chao Yu > --- > v3: > - change commit title. > - fix wrong macro name. > fs/f2fs/f2fs.h | 15 +++++++++++++++ > fs/f2fs/super.c | 10 ++++++++++ > include/linux/f2fs_fs.h | 3 ++- > 3 files changed, 27 insertions(+), 1 deletion(-) > > diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h > index a6eb828af57f..b8e17d4ddb8d 100644 > --- a/fs/f2fs/f2fs.h > +++ b/fs/f2fs/f2fs.h > @@ -163,6 +163,15 @@ struct f2fs_mount_info { > #define F2FS_CLEAR_FEATURE(sbi, mask) \ > (sbi->raw_super->feature &= ~cpu_to_le32(mask)) > > +#define F2FS_INCOMPAT_FEATURES 0 > + > +#define F2FS_HAS_INCOMPAT_FEATURE(sbi, mask) \ > + ((sbi->raw_super->required_features & cpu_to_le32(mask)) != 0) > +#define F2FS_SET_INCOMPAT_FEATURE(sbi, mask) \ > + (sbi->raw_super->required_features |= cpu_to_le32(mask)) > +#define F2FS_CLEAR_INCOMPAT_FEATURE(sbi, mask) \ > + (sbi->raw_super->required_features &= ~cpu_to_le32(mask)) > + > /* > * Default values for user and/or group using reserved blocks > */ > @@ -3585,6 +3594,12 @@ F2FS_FEATURE_FUNCS(lost_found, LOST_FOUND); > F2FS_FEATURE_FUNCS(sb_chksum, SB_CHKSUM); > F2FS_FEATURE_FUNCS(casefold, CASEFOLD); > > +#define F2FS_INCOMPAT_FEATURE_FUNCS(name, flagname) \ > +static inline int f2fs_sb_has_##name(struct f2fs_sb_info *sbi) \ > +{ \ > + return F2FS_HAS_INCOMPAT_FEATURE(sbi, F2FS_FEATURE_##flagname); \ > +} > + > #ifdef CONFIG_BLK_DEV_ZONED > static inline bool f2fs_blkz_is_seq(struct f2fs_sb_info *sbi, int devi, > block_t blkaddr) > diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c > index 5540fee0fe3f..3701dcce90e6 100644 > --- a/fs/f2fs/super.c > +++ b/fs/f2fs/super.c > @@ -2513,6 +2513,16 @@ static int sanity_check_raw_super(struct f2fs_sb_info *sbi, > return -EINVAL; > } > > + /* check whether current kernel supports all features on image */ > + if (le32_to_cpu(raw_super->required_features) & ... #define F2FS_FEATURE_VERITY 0x0400 /* reserved */ ... #define F2FS_FEATURE_CASEFOLD 0x1000 #define F2FS_FEATURE_SUPPORT 0x1BFF if (le32_to_cpu(raw_super->required_features) & ~F2FS_FEATURE_SUPPORT) { ... return -EINVAL; } > + ~F2FS_INCOMPAT_FEATURES) { > + f2fs_info(sbi, "Unsupported feature: %x: supported: %x", > + le32_to_cpu(raw_super->required_features) ^ > + F2FS_INCOMPAT_FEATURES, > + F2FS_INCOMPAT_FEATURES); > + return -EINVAL; > + } > + > /* Check checksum_offset and crc in superblock */ > if (__F2FS_HAS_FEATURE(raw_super, F2FS_FEATURE_SB_CHKSUM)) { > crc_offset = le32_to_cpu(raw_super->checksum_offset); > diff --git a/include/linux/f2fs_fs.h b/include/linux/f2fs_fs.h > index a2b36b2e286f..4141be3f219c 100644 > --- a/include/linux/f2fs_fs.h > +++ b/include/linux/f2fs_fs.h > @@ -117,7 +117,8 @@ struct f2fs_super_block { > __u8 hot_ext_count; /* # of hot file extension */ > __le16 s_encoding; /* Filename charset encoding */ > __le16 s_encoding_flags; /* Filename charset encoding flags */ > - __u8 reserved[306]; /* valid reserved region */ > + __le32 required_features; /* incompatible features to old kernel */ > + __u8 reserved[302]; /* valid reserved region */ > __le32 crc; /* checksum of superblock */ > } __packed; > > -- > 2.22.0