PROPOSAL: extend UNIX_INFO2 to mark existence of ACLs

[Steve French]

simo wrote:

>On Tue, 2008-01-22 at 15:23 -0600, Steve French wrote:
>  
>
>>James Peach wrote:
>>
>>    
>>
>>>Hi all,
>>>
>>>Unix SMB client could often avoid a few round-trips to the server if  
>>>they could tell whether a file had an ACL at the point where they  
>>>query its metadata (presumably using the UNIX_INFO2 info level).
>>>
>>>Since the permissions field is 64bits, how about stealing the high 
>>>bit  of this field to indicate whether the file might have an ACL?
>>>
>>>We'd probably need a mechanism for clients to figure out whether the  
>>>bit was meaningful or not ....
>>>
>>>
>>>      
>>>
>>Do you mean POSIX ACL or NT ACL? 
>>
>>For the case of an NT ACL, how would you distinguish between the case in 
>>which the file has an emulated ACL and a "real" ACL?  If you query the 
>>NT ACL eg. with smbcacls, Samba will report one, even on files which do 
>>not have an ACL.
>>    
>>
>
>Steve,
>given this is a "unix" extension I guess it is a Posix or NFSv4 ACL.
>
>I am not sure it make sense to signal we have an emulated NT ACL, what
>would we use it for ?
>
>Simo.
>
>  
>
There are systems which support Unix Extensions but do not support POSIX 
ACLs.