Extending text-format ACLs

[Tim Kientzle]

In doing further testing on my 'tar' implementation,
I'm wondering if there's a way to improve the
efficiency of acl_get_file.

In particular, I've found that acl_get_file is
the biggest malloc consumer I have.  I'm calling
acl_get_file twice for every file (for access and
default ACLs), and each call invokes acl_init to
create the ACL structure (which almost always
gets immediately freed when I discover that it has
only the standard entries).

I know I can skip the default ACL for non-directories,
which would cut out a lot of the heap pressure, but
I would like to find a way to avoid calling
acl_get_file unless I know I need to.

Ideally, I'd like some piece of data in struct stat
that I can use to tell whether or not there is
extended ACL data for this file.  (Maybe a read-only
bit in st_flags that indicates "extended ACL exists"?)

Any thoughts?

Tim Kientzle


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