linux-kernel - [PATCH] f2fs: fix to do sanity with enabled features in image

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Date:   Wed, 24 Apr 2019 17:48:50 +0800
From:   Chao Yu <yuchao0@...wei.com>
To:     <jaegeuk@...nel.org>
CC:     <linux-f2fs-devel@...ts.sourceforge.net>,
        <linux-kernel@...r.kernel.org>, <chao@...nel.org>,
        Chao Yu <yuchao0@...wei.com>
Subject: [PATCH] f2fs: fix to do sanity with enabled features in image

This patch fixes to do sanity with enabled features in image, if
there are features kernel can not recognize, just fail the mount.

Signed-off-by: Chao Yu <yuchao0@...wei.com>
---
 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