btrfs: get fs_info from eb in btrfs_verify_level_key

We can read fs_info from extent buffer and can drop it from the
parameters.
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/ctree.c

@@ -2420,7 +2420,7 @@ read_block_for_search(struct btrfs_root *root, struct btrfs_path *p,
 			 * being cached, read from scrub, or have multiple
 			 * parents (shared tree blocks).
 			 */
-			if (btrfs_verify_level_key(fs_info, tmp,
+			if (btrfs_verify_level_key(tmp,
 					parent_level - 1, &first_key, gen)) {
 				free_extent_buffer(tmp);
 				return -EUCLEAN;

fs/btrfs/disk-io.c

@@ -394,10 +394,10 @@ static int btrfs_check_super_csum(struct btrfs_fs_info *fs_info,
 	return ret;
 }
 
-int btrfs_verify_level_key(struct btrfs_fs_info *fs_info,
-			   struct extent_buffer *eb, int level,
+int btrfs_verify_level_key(struct extent_buffer *eb, int level,
 			   struct btrfs_key *first_key, u64 parent_transid)
 {
+	struct btrfs_fs_info *fs_info = eb->fs_info;
 	int found_level;
 	struct btrfs_key found_key;
 	int ret;
@@ -471,7 +471,7 @@ static int btree_read_extent_buffer_pages(struct extent_buffer *eb,
 			if (verify_parent_transid(io_tree, eb,
 						   parent_transid, 0))
 				ret = -EIO;
-			else if (btrfs_verify_level_key(fs_info, eb, level,
+			else if (btrfs_verify_level_key(eb, level,
 						first_key, parent_transid))
 				ret = -EUCLEAN;
 			else

fs/btrfs/disk-io.h

@@ -39,8 +39,7 @@ static inline u64 btrfs_sb_offset(int mirror)
 struct btrfs_device;
 struct btrfs_fs_devices;
 
-int btrfs_verify_level_key(struct btrfs_fs_info *fs_info,
-			   struct extent_buffer *eb, int level,
+int btrfs_verify_level_key(struct extent_buffer *eb, int level,
 			   struct btrfs_key *first_key, u64 parent_transid);
 struct extent_buffer *read_tree_block(struct btrfs_fs_info *fs_info, u64 bytenr,
 				      u64 parent_transid, int level,