7.2. EA Namespaces

The EA set is typically divided into namespaces

For Linux the namespace is the prefix of the EA name:

user
trusted
security
System

For XFS, the namespace is encoded in bits in a flags field with these values:

“user” has value of 0x0000 – by default an attribute is in the user namespace

#define ATTR_ROOT	0x0002 /* use attrs in root (trusted) namespace */
#define ATTR_SECURE	0x0008 /* use attrs in security namespace */
#define ATTR_SYSTEM	0x0100 /* use attrs in system (pseudo) namespace */

So for XFS, EAs are really a triple <name, value, flags>