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List:       netbsd-tech-kern
Subject:    Re: union mount directory permissions
From:       David Laight <david () l8s ! co ! uk>
Date:       2004-09-28 7:09:27
Message-ID: 20040928070927.GA891 () snowdrop ! l8s ! co ! uk
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> 
>      * policy: when creating the shadow directory in the
>      * upper layer, create it owned by the user who did
>      * the mount, group from parent directory, and mode
>      * 777 modified by umask (ie mostly identical to the
>      * mkdir syscall).  (jsp, kb)
> 
> uhm.. so, why?  File permissions and ownership are copied.  Shouldn't
> directories behave the same?

When I wrote a union fs, I created directories with the permissions
of their real parent.

I also deceided that the 'copy file into top layer' action was
unnecessary.  Nothing we ran needed it.

I did try to use the feature of SVR4 VOP_OPEN() that allows it to return
a different vnode (use for clone open on special devices) but not all
of the kernel liked me doing that.


	David

-- 
David Laight: david@l8s.co.uk
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