wait_on_bit_action
wait_on_bit_action(&NFS_I(inode)->flags, NFS_INO_INVALIDATING,
ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING,
res = wait_on_bit_action(&clp->cl_state, NFS4CLNT_MANAGER_RUNNING,
return wait_on_bit_action(&lo->plh_flags, NFS_LAYOUT_RETURN,