FI_FREE_NID
set_inode_flag(inode, FI_FREE_NID);
set_inode_flag(inode, FI_FREE_NID);
if (is_inode_flag_set(inode, FI_FREE_NID)) {
clear_inode_flag(inode, FI_FREE_NID);
set_inode_flag(inode, FI_FREE_NID);
set_inode_flag(inode, FI_FREE_NID);