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[209.132.180.67]) by mx.google.com with ESMTP id ci23si10560649pjb.85.2019.07.23.09.19.20; Tue, 23 Jul 2019 09:19:36 -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 S2388073AbfGWHCt (ORCPT + 99 others); Tue, 23 Jul 2019 03:02:49 -0400 Received: from szxga06-in.huawei.com ([45.249.212.32]:48574 "EHLO huawei.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1725837AbfGWHCs (ORCPT ); Tue, 23 Jul 2019 03:02:48 -0400 Received: from DGGEMS409-HUB.china.huawei.com (unknown [172.30.72.59]) by Forcepoint Email with ESMTP id 98D30E3EF60CA17B3872; Tue, 23 Jul 2019 15:01:38 +0800 (CST) Received: from [10.134.22.195] (10.134.22.195) by smtp.huawei.com (10.3.19.209) with Microsoft SMTP Server (TLS) id 14.3.439.0; Tue, 23 Jul 2019 15:01:33 +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> From: Chao Yu Message-ID: <00726135-f210-7791-a372-ef9cb1ae209f@huawei.com> Date: Tue, 23 Jul 2019 15:01:31 +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: <20190723013546.GA60778@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 2019/7/23 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? 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 >>> . >>> > . >