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POSIX ACLs - the non-standard standard
Not an official POSIX standard.
Draft standard 1003.1e revision 17 is the API Samba standardized on.
Differences in vendor implementations of this API mean Samba needs a interface layer to map to underlying OS.
- Linux - the UNIX defragmentation tool - uses 1003.1e draft 17 as the API - so identity mapping is used on Linux.
Implementation of ACL support in Samba has increased pressure on ACL standardization.