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bh=UAZx6nftTql1aqEdgqnyC1ff8Z/VwXfneWHWV9A/U2o=; b=h nfzcki5VTR/9HUxJkHJpdgP2W3bZJXujHuIl/ishfqXxOJygkFROBjREnwBKUx9d00C3a6IqDMsUS tSJTKhyxT26TE2bXK6tbNLhjuJffQAMhPV6CWEA5lQMzgQNzZ8+gK8qVMLbmJ81NWtLxigFya3oJf bmaNbf0q0+pImheI=; Received: from mail.kernel.org ([198.145.29.99]) by sfi-mx-1.v28.lw.sourceforge.com with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.90_1) id 1hs6te-00Ednl-Iu for linux-f2fs-devel@lists.sourceforge.net; Mon, 29 Jul 2019 14:45:09 +0000 Received: from localhost.localdomain (unknown [180.111.32.87]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 5CA22206BA; Mon, 29 Jul 2019 14:44:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1564411500; bh=ZJaCH6/EG+GnwaN6bqP7F/RqkgpTASOAGcigZFAnIpA=; h=From:To:Cc:Subject:Date:From; b=TmvZSnG9lh5mWO+cGUplu/CmjSJvwa2qTah96YjGVYfbj9ierPPBmN9AieTmH7SRJ AYCDXgiyWmdeT3MzmJ2zd5kkoAg5OHeQXQBCE5L28CUqt+mLFfjiTSsAhpkPWZF3Y7 f97y+zozRZJ/mGj4OJcR/r2n/uRUKi0xGdpYwuLc= From: Chao Yu To: jaegeuk@kernel.org Date: Sun, 28 Jul 2019 23:15:26 +0800 Message-Id: <20190728151526.11845-1-chao@kernel.org> X-Mailer: git-send-email 2.22.0 MIME-Version: 1.0 X-Headers-End: 1hs6te-00Ednl-Iu Subject: [f2fs-dev] [PATCH v3] f2fs: introduce sb.required_features to store incompatible features X-BeenThere: linux-f2fs-devel@lists.sourceforge.net X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-kernel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net 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) & + ~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 _______________________________________________ Linux-f2fs-devel mailing list Linux-f2fs-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel