postfix read only permission

[Adiel01]

Guys 

i want to make changes on resolv.conf and postfix/main.cf  on login node on Cray XC30 AC  but its telling me read only even if i am superuser 

i  directories and main.cf already have  read  write excute permissions  so chown chmod wont make any difference .

below ls  lstr  /etc/postfix 

drwxr-xr-x 2 root root 4096 Dec 11 2015 .
drwxr-xr-x 141 root root 12288 Mar 5 2024 ..
lrwxrwxrwx 1 root root 41 Nov 19 2014 LICENSE -> /.shared/base/default/etc/postfix/LICENSE
lrwxrwxrwx 1 root root 45 Nov 19 2014 TLS_LICENSE -> /.shared/base/default/etc/postfix/TLS_LICENSE
lrwxrwxrwx 1 root root 40 Nov 19 2014 access -> /.shared/base/default/etc/postfix/access
lrwxrwxrwx 1 root root 41 Nov 19 2014 aliases -> /.shared/base/default/etc/postfix/aliases
lrwxrwxrwx 1 root root 51 Nov 19 2014 bounce.cf.default -> /.shared/base/default/etc/postfix/bounce.cf.default
lrwxrwxrwx 1 root root 43 Nov 19 2014 canonical -> /.shared/base/default/etc/postfix/canonical
lrwxrwxrwx 1 root root 48 Nov 19 2014 dynamicmaps.cf -> /.shared/base/default/etc/postfix/dynamicmaps.cf
lrwxrwxrwx 1 root root 41 Nov 19 2014 generic -> /.shared/base/default/etc/postfix/generic
lrwxrwxrwx 1 root root 47 Nov 19 2014 header_checks -> /.shared/base/default/etc/postfix/header_checks
lrwxrwxrwx 1 root root 40 Jul 27 2015 main.cf -> /.shared/base/node/9/etc/postfix/main.cf
lrwxrwxrwx 1 root root 49 Nov 19 2014 main.cf.default -> /.shared/base/default/etc/postfix/main.cf.default
lrwxrwxrwx 1 root root 46 Nov 19 2014 makedefs.out -> /.shared/base/default/etc/postfix/makedefs.out
lrwxrwxrwx 1 root root 43 Nov 19 2014 master.cf -> /.shared/base/default/etc/postfix/master.cf
lrwxrwxrwx 1 root root 57 Nov 19 2014 openssl_postfix.conf.in -> /.shared/base/default/etc/postfix/openssl_postfix.conf.in
lrwxrwxrwx 1 root root 46 Nov 19 2014 relay_ccerts -> /.shared/base/default/etc/postfix/relay_ccerts
lrwxrwxrwx 1 root root 43 Nov 19 2014 relocated -> /.shared/base/default/etc/postfix/relocated
lrwxrwxrwx 1 root root 45 Nov 19 2014 sasl_passwd -> /.shared/base/default/etc/postfix/sasl_passwd
lrwxrwxrwx 1 root root 50 Nov 19 2014 sender_canonical -> /.shared/base/default/etc/postfix/sender_canonical
lrwxrwxrwx 1 root root 43 Nov 19 2014 transport -> /.shared/base/default/etc/postfix/transport
lrwxrwxrwx 1 root root 41 Nov 19 2014 virtual -> /.shared/base/default/etc/postfix/virtual