a queston about ACL acl_type_t

[kai ouyang]

Hi,
I am trying to understand the ACL implementation in FreeBSD-Current. I have a question about ACL.
in "acl.h", there are some acl_type_t value macro:
/*
* Possible valid values for acl_type_t arguments.
*/
#define ACL_TYPE_ACCESS 0x00000000
#define ACL_TYPE_DEFAULT 0x00000001
#define ACL_TYPE_AFS 0x00000002
#define ACL_TYPE_CODA 0x00000003
#define ACL_TYPE_NTFS 0x00000004
#define ACL_TYPE_NWFS 0x00000005

But I am not sure what's means.
in the 'setfacl' source, I found the usage:
If we want to control a directory,
acl[ACL_TYPE_DEFAULT] = acl_get_file(filename, ACL_TYPE_DEFAULT);
if we want to sontrol a file,
acl[DEFAULT_ACL] = NULL;
Why?
What's the difference among those macros?
Why must a directory object reserve two acl_t_structs, and a file only need one?

Thank you!

Best Regards
Ouyang Kai




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