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[209.132.180.67]) by mx.google.com with ESMTP id f186si24941389pgc.438.2019.07.29.00.10.56; Mon, 29 Jul 2019 00:11:12 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726709AbfG2HJh (ORCPT + 99 others); Mon, 29 Jul 2019 03:09:37 -0400 Received: from szxga06-in.huawei.com ([45.249.212.32]:38670 "EHLO huawei.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1725957AbfG2HJg (ORCPT ); Mon, 29 Jul 2019 03:09:36 -0400 Received: from DGGEMS410-HUB.china.huawei.com (unknown [172.30.72.58]) by Forcepoint Email with ESMTP id 6BEF6B5D462CD359A977; Mon, 29 Jul 2019 15:09:34 +0800 (CST) Received: from [10.134.22.195] (10.134.22.195) by smtp.huawei.com (10.3.19.210) with Microsoft SMTP Server (TLS) id 14.3.439.0; Mon, 29 Jul 2019 15:09:30 +0800 Subject: Re: [f2fs-dev] [PATCH] f2fs: fix to do sanity with enabled features in image To: Jaegeuk Kim CC: Chao Yu , , References: <20190424094850.118323-1-yuchao0@huawei.com> <20190428133802.GB37346@jaegeuk-macbookpro.roam.corp.google.com> <373f4633-d331-5cf3-74b7-e982072bc4b4@kernel.org> <20190501032242.GA84420@jaegeuk-macbookpro.roam.corp.google.com> <3f170d86-e556-13ae-ce19-3bba3944f5fa@huawei.com> <192bae92-2193-570f-7b50-00334271bd2e@huawei.com> <20190723013546.GA60778@jaegeuk-macbookpro.roam.corp.google.com> <00726135-f210-7791-a372-ef9cb1ae209f@huawei.com> <20190729054706.GB94090@jaegeuk-macbookpro.roam.corp.google.com> From: Chao Yu Message-ID: Date: Mon, 29 Jul 2019 15:09:29 +0800 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <20190729054706.GB94090@jaegeuk-macbookpro.roam.corp.google.com> Content-Type: text/plain; charset="windows-1252" Content-Language: en-US Content-Transfer-Encoding: 7bit X-Originating-IP: [10.134.22.195] X-CFilter-Loop: Reflected Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2019/7/29 13:47, Jaegeuk Kim wrote: > On 07/23, Chao Yu wrote: >> On 2019/7/23 9:35, Jaegeuk Kim wrote: >>> On 07/16, Chao Yu wrote: >>>> Hi Jaegeuk, >>>> >>>> On 2019/5/9 9:15, Chao Yu wrote: >>>>> On 2019/5/5 10:51, Chao Yu wrote: >>>>>> On 2019/5/1 11:22, Jaegeuk Kim wrote: >>>>>>> On 04/29, Chao Yu wrote: >>>>>>>> On 2019-4-28 21:38, Jaegeuk Kim wrote: >>>>>>>>> On 04/24, Chao Yu wrote: >>>>>>>>>> This patch fixes to do sanity with enabled features in image, if >>>>>>>>>> there are features kernel can not recognize, just fail the mount. >>>>>>>>> >>>>>>>>> We need to figure out per-feature-based rejection, since some of them can >>>>>>>>> be set without layout change. >>>> >>>> What about adding one field in superblock for compatible features in future? >>>> >>>> sb.feature(F2FS_FEATURE_LAST, max] stores uncompatible features >>>> sb.compatible_feature stores compatible features >>>> >>>> If we follow above rule when adding one feature, then, we can fail the mount if >>>> sb.feature(F2FS_FEATURE_LAST, max] is valid. >>> >>> How about adding required_features flag in sb to check part of features only? >> >> You mean all incompatible features can be add into sb.required_features later >> like this? >> >> __le32 required_features; /* incompatible feature to old kernel */ >> >> And we can check required_features with supported features in current kernel? > > Yeah, I think so. Copied, let me update the patch. Thanks, > >> >> if (le32_to_cpu(raw_super->required_features) & >> (~NOW_SUPPORTED_FEATURES_IN_CURRENT_KERNEL)) { >> print msg & ret error; >> } >> >> Thanks, >> >>> >>>> >>>> Thanks, >>>> >>>>>>>> >>>>>>>> So any suggestion on how to implement this? >>>>>>> >>>>>>> Which features do we need to disallow? When we introduce new features, they >>>>>> >>>>>> I guess it should be the new features. >>>>>> >>>>>>> didn't hurt the previous flow by checking f2fs_sb_has_###(). >>>>>> >>>>>> Yes, but new features may use new disk layout, if old kernel handled it with old >>>>>> disk layout, there must be problematic. >>>>>> >>>>>> e.g. format image with -O extra_attr, and mount it with kernel who don't >>>>>> recognize new inode layout. >>>>> >>>>> Jaegeuk, >>>>> >>>>> Any thoughts? >>>>> >>>>> Thanks, >>>>> >>>>>> >>>>>> Thanks, >>>>>> >>>>>>> >>>>>>>> >>>>>>>> Maybe: >>>>>>>> >>>>>>>> if (LINUX_VERSION_CODE < KERNEL_VERSION(4, 14, 0)) >>>>>>>> check 4.14+ features >>>>>>>> else if (LINUX_VERSION_CODE < KERNEL_VERSION(4, 9, 0)) >>>>>>>> check 4.9+ features >>>>>>>> else if (LINUX_VERSION_CODE < KERNEL_VERSION(4, 4, 0)) >>>>>>>> check 4.4+ features >>>>>>>> >>>>>>>> Thanks, >>>>>>>> >>>>>>>>> >>>>>>>>>> >>>>>>>>>> Signed-off-by: Chao Yu >>>>>>>>>> --- >>>>>>>>>> fs/f2fs/f2fs.h | 13 +++++++++++++ >>>>>>>>>> fs/f2fs/super.c | 9 +++++++++ >>>>>>>>>> 2 files changed, 22 insertions(+) >>>>>>>>>> >>>>>>>>>> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h >>>>>>>>>> index f5ffc09705eb..15b640967e12 100644 >>>>>>>>>> --- a/fs/f2fs/f2fs.h >>>>>>>>>> +++ b/fs/f2fs/f2fs.h >>>>>>>>>> @@ -151,6 +151,19 @@ struct f2fs_mount_info { >>>>>>>>>> #define F2FS_FEATURE_VERITY 0x0400 /* reserved */ >>>>>>>>>> #define F2FS_FEATURE_SB_CHKSUM 0x0800 >>>>>>>>>> >>>>>>>>>> +#define F2FS_ALL_FEATURES (F2FS_FEATURE_ENCRYPT | \ >>>>>>>>>> + F2FS_FEATURE_BLKZONED | \ >>>>>>>>>> + F2FS_FEATURE_ATOMIC_WRITE | \ >>>>>>>>>> + F2FS_FEATURE_EXTRA_ATTR | \ >>>>>>>>>> + F2FS_FEATURE_PRJQUOTA | \ >>>>>>>>>> + F2FS_FEATURE_INODE_CHKSUM | \ >>>>>>>>>> + F2FS_FEATURE_FLEXIBLE_INLINE_XATTR | \ >>>>>>>>>> + F2FS_FEATURE_QUOTA_INO | \ >>>>>>>>>> + F2FS_FEATURE_INODE_CRTIME | \ >>>>>>>>>> + F2FS_FEATURE_LOST_FOUND | \ >>>>>>>>>> + F2FS_FEATURE_VERITY | \ >>>>>>>>>> + F2FS_FEATURE_SB_CHKSUM) >>>>>>>>>> + >>>>>>>>>> #define __F2FS_HAS_FEATURE(raw_super, mask) \ >>>>>>>>>> ((raw_super->feature & cpu_to_le32(mask)) != 0) >>>>>>>>>> #define F2FS_HAS_FEATURE(sbi, mask) __F2FS_HAS_FEATURE(sbi->raw_super, mask) >>>>>>>>>> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c >>>>>>>>>> index 4f8e9ab48b26..57f2fc6d14ba 100644 >>>>>>>>>> --- a/fs/f2fs/super.c >>>>>>>>>> +++ b/fs/f2fs/super.c >>>>>>>>>> @@ -2573,6 +2573,15 @@ static int sanity_check_raw_super(struct f2fs_sb_info *sbi, >>>>>>>>>> return 1; >>>>>>>>>> } >>>>>>>>>> >>>>>>>>>> + /* check whether kernel supports all features */ >>>>>>>>>> + if (le32_to_cpu(raw_super->feature) & (~F2FS_ALL_FEATURES)) { >>>>>>>>>> + f2fs_msg(sb, KERN_INFO, >>>>>>>>>> + "Unsupported feature:%u: supported:%u", >>>>>>>>>> + le32_to_cpu(raw_super->feature), >>>>>>>>>> + F2FS_ALL_FEATURES); >>>>>>>>>> + return 1; >>>>>>>>>> + } >>>>>>>>>> + >>>>>>>>>> /* check CP/SIT/NAT/SSA/MAIN_AREA area boundary */ >>>>>>>>>> if (sanity_check_area_boundary(sbi, bh)) >>>>>>>>>> return 1; >>>>>>>>>> -- >>>>>>>>>> 2.18.0.rc1 >>>>>>> . >>>>>>> >>>>>> >>>>>> >>>>>> _______________________________________________ >>>>>> Linux-f2fs-devel mailing list >>>>>> Linux-f2fs-devel@lists.sourceforge.net >>>>>> https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel >>>>>> . >>>>>> >>>>> >>>>> >>>>> _______________________________________________ >>>>> Linux-f2fs-devel mailing list >>>>> Linux-f2fs-devel@lists.sourceforge.net >>>>> https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel >>>>> . >>>>> >>> . >>> > . >