On Thu, 22 Oct 2020 08:52:38 -0700, Charles Mills wrote:

>Putting it differently, there is no distinction between "member data space" 
>and "directory entry space." Being out of one is being out of both. A PDSE of 
>10 tracks could equally well hold one member of ~500K or lots and lots of tiny 
>or "null" members. A mischievous programmer adding an unbounded number of 
>empty members would be no different in effect from a mischievous programmer 
>adding one member of unbounded size.
> 
Similar to modern UNIX filesystems' removing the boundary between inode
space and member space:
    $ df -k /
    Filesystem   1024-blocks      Used Available Capacity iused               
ifree %iused  Mounted on
     /dev/disk3s1   195312500 133893044  57597328    70% 1662310 
9223372036853113497    0%   /

-- gil

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