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

[Chao Yu]

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@xxxxxxxxxx>
---
 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