btrfs-progs: btrfstune: Rename change_header_uuid to change_buffer_he…

…ader_uuid

Rename the function so its name falls in line with the rest of btrfs
nomenclature. So when we change the uuid of the header it's in fact of
the buffer header. Also remove the root argument since it's used solely
to take a reference to fs_info which can be done via the mandatory eb
argument. No functional changes.

Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

btrfstune.c

@@ -91,9 +91,9 @@ static int set_super_incompat_flags(struct btrfs_root *root, u64 flags)
 	return ret;
 }
 
-static int change_header_uuid(struct btrfs_root *root, struct extent_buffer *eb)
+static int change_buffer_header_uuid(struct extent_buffer *eb)
 {
-	struct btrfs_fs_info *fs_info = root->fs_info;
+	struct btrfs_fs_info *fs_info = eb->fs_info;
 	int same_fsid = 1;
 	int same_chunk_tree_uuid = 1;
 	int ret;
@@ -157,7 +157,7 @@ static int change_extents_uuid(struct btrfs_fs_info *fs_info)
 			ret = PTR_ERR(eb);
 			goto out;
 		}
-		ret = change_header_uuid(root, eb);
+		ret = change_buffer_header_uuid(eb);
 		free_extent_buffer(eb);
 		if (ret < 0) {
 			error("failed to change uuid of tree block: %llu",