"chmod A-" does not work (ERROR: Operation not supported)
Observed on OpenIndiana 2019.05
The "chmod A-" command, which is used to removed ACLs (see "man chmod") does
not work. It stops with the following message:
ERROR: Operation not supported
This command used to work on Oracle Solaris 10.
cd /tmp touch abc getfacl abc # this works chmod A- abc ERROR: Operation not supported
Updated by Hubert Garavel over 3 years ago
The files are on /tmp, which is mounted as swap. This is the default installation
made by OpenIndiana installer, no custom changes have been made.
On a ZFS file system, "chmod A-" works normally. So the problem occurs for a
swap file system.