f2fs: fix to consider multiple device for readonly check

This patch introduce f2fs_hw_is_readonly() to check whether lower
device is readonly or not, it adapts multiple device scenario.
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/f2fs.h

@@ -3609,6 +3609,20 @@ static inline bool f2fs_realtime_discard_enable(struct f2fs_sb_info *sbi)
 					f2fs_hw_should_discard(sbi);
 }
 
+static inline bool f2fs_hw_is_readonly(struct f2fs_sb_info *sbi)
+{
+	int i;
+
+	if (!f2fs_is_multi_device(sbi))
+		return bdev_read_only(sbi->sb->s_bdev);
+
+	for (i = 0; i < sbi->s_ndevs; i++)
+		if (bdev_read_only(FDEV(i).bdev))
+			return true;
+	return false;
+}
+
+
 static inline void set_opt_mode(struct f2fs_sb_info *sbi, unsigned int mt)
 {
 	clear_opt(sbi, ADAPTIVE);

fs/f2fs/super.c

@@ -3377,7 +3377,7 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
 		 * mount should be failed, when device has readonly mode, and
 		 * previous checkpoint was not done by clean system shutdown.
 		 */
-		if (bdev_read_only(sb->s_bdev) &&
+		if (f2fs_hw_is_readonly(sbi) &&
 				!is_set_ckpt_flags(sbi, CP_UMOUNT_FLAG)) {
 			err = -EROFS;
 			goto free_meta;