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4.9.2. Changing the Default Context

As mentioned in Section 4.8, “The file_t and default_t Types”, on file systems that support extended attributes, when a file that lacks an SELinux context on disk is accessed, it is treated as if it had a default context as defined by SELinux policy. In common policies, this default context uses the file_t type. If it is desirable to use a different default context, mount the file system with the defcontext option.
The following example mounts a newly-created file system on /dev/sda2 to the newly-created /test/ directory. It assumes that there are no rules in /etc/selinux/targeted/contexts/files/ that define a context for the /test/ directory:
~]# mount /dev/sda2 /test/ -o defcontext="system_u:object_r:samba_share_t:s0"
In this example:

[7] Morris, James. "Filesystem Labeling in SELinux". Published 1 October 2004. Accessed 14 October 2008: