How to find bash shell function source code on Linux/Unix

foo is a function
foo () 
{ 
    local l="$1";
    [[ $l == "" ]] && /usr/bin/lxc exec vm -- /root/bin/uploads on;
    /usr/bin/lxc exec vm -- /bin/bash;
    [[ $l == "" ]] || return 0;
    wait;
    /usr/bin/lxc exec vm -- /root/bin/uploads off;
    sudo -i /root/bin/master.replication -v;
}

To list all function names, type:
$ declare -F
$ declare -F | grep function_name
$ declare -F | grep foo
Sample outputs:

declare -f __expand_tilde_by_ref
declare -f __get_cword_at_cursor_by_ref
declare -f __git_eread
declare -f __git_ps1
declare -f __git_ps1_colorize_gitstring
declare -f __git_ps1_show_upstream
declare -f __grub_dir
declare -f __grub_get_last_option
declare -f __grub_get_options_from_help
declare -f __grub_get_options_from_usage
declare -f __grub_list_menuentries
declare -f __grub_list_modules
declare -f __grubcomp
declare -f __ltrim_colon_completions
declare -f __parse_options
declare -f __reassemble_comp_words_by_ref
declare -f _allowed_groups
declare -f _allowed_users
declare -f _available_interfaces
declare -f _cd
....
..
...
declare -f _uids
declare -f _upvar
declare -f _upvars
declare -f _usb_ids
declare -f _user_at_host
declare -f _usergroup
declare -f _userland
declare -f _variables
declare -f _xfunc
declare -f _xinetd_services
declare -f cbz_wp_admin
declare -f command_not_found_handle
declare -f del_all_mem_cache
declare -f dequote
declare -f quote
declare -f quote_readline

To see see quote() definition:
$ declare -f quote
Sample outputs:

quote () 
{ 
    local quoted=${1//\'/\'\\\'\'};
    printf "'%s'" "$quoted"
}

How do I find the file where a bash function is defined?

The syntax is as follows:
$ shopt -s extdebug
$ declare -F quote
quote 143 /usr/share/bash-completion/bash_completion
$ declare -F cbz_wp_admin
cbz_wp_admin 14 /home/vivek/.bash_aliases
The quote() is defined /usr/share/bash-completion/bash_completion file at 143 line. Same way the cbz_wp_admin() defined in /home/vivek/.bash_aliases at line # 14. You can start it as follows too:
$ bash --debugger
$ declare -F function_name()
$ declare -F cbz_wp_admin