Re: ACL patch

[christos%astron.com@localhost (Christos Zoulas)]

In article <20200512235040.GD9377%homeworld.netbsd.org@localhost>,
Andrew Doran  <ad%netbsd.org@localhost> wrote:
>On Tue, May 12, 2020 at 10:37:27PM +0000, Andrew Doran wrote:
>> On Sun, May 10, 2020 at 09:48:10AM -0400, Christos Zoulas wrote:
>> > 
>> > > Maybe I missed it but I didn't see a way for cache_lookup_linked() and
>> > > cache_have_id() to know a vnode has ACLs.  The presence of ACLs
>means those
>> > > routines can't do their imitation of VOP_ACCESS() and need to fail so that
>> > > the lookup is handled by VOP_LOOKUP().  To handle that on a
>per-vnode basis
>> > > you'd want to flag the "has ACLs" fact when an inode is loaded, and do the
>> > > same when an ACL is added to an in-core inode.  I'll look into it over the
>> > > next few days unless you want to take care of it.
>> > 
>> > So I looked into this a bit and genfs_can_access() is also used by 
>cache_revlookup.
>> > I am not sure what to do here. It is simple enough to add a flag to
>the vnode to indicate
>> > if it has ACLs, but is it the right thing to do?
>> 
>> I tried to pull down your patch again over the weekend to take a look but it
>> was gone.  The best place for a flag would be cache_enter_id() since it
>> deals with the necessary synchronisation.  I'll see about adding a flag now.
>> In addition to the places it's called now it would need to be called
>> whenever an inode gains an ACL.
>
>Ok done should just need to mark the cached ID as invalid when the inode has
>/ gains an ACL.

Ok, thanks!

christos