+static int validate_superblock(struct super_block *sb,
+ struct f2fs_super_block **raw_super,
+ struct buffer_head **raw_super_buf, sector_t block)
+{
+ const char *super = (block == 0 ? "first" : "second");
+
+ /* read f2fs raw super block */
+ *raw_super_buf = sb_bread(sb, block);
+ if (!*raw_super_buf) {
+ f2fs_msg(sb, KERN_ERR, "unable to read %s superblock",
+ super);
+ return 1;
+ }
+
+ *raw_super = (struct f2fs_super_block *)
+ ((char *)(*raw_super_buf)->b_data + F2FS_SUPER_OFFSET);
+
+ /* sanity checking of raw super */
+ if (!sanity_check_raw_super(sb, *raw_super))
+ return 0;
+
+ f2fs_msg(sb, KERN_ERR, "Can't find a valid F2FS filesystem "
+ "in %s superblock", super);
+ return 1;
+}
+