btrfs_inode_split_flags
btrfs_inode_split_flags(btrfs_stack_inode_flags(inode_item),
btrfs_inode_split_flags(btrfs_inode_flags(leaf, inode_item),
btrfs_inode_split_flags(btrfs_inode_flags(leaf, iitem), &flags, &ro_flags);