Auto directory resize

[Guy Harris]

>Is anyone aware of a flavor of Unix(tm) which will automatically resize a 
>directory once files have been removed from it?? 

No (which doesn't mean that none does), but I'm aware of one that, when
it searches a directory when preparing to make a *new* entry in the
directory, will chop off any empty blocks at the end of the directory,
namely 4.3BSD.  (I suspect it was easier that way; said search has to go
all the way to the end of the directory anyway, but the deletion
operation doesn't.)

Flavors of UNIX that use that file system may do so also (SunOS 4.0[.x],
while running the 4.3BSD version of the BSD file system, didn't pick
that up as part of the 4.3BSDification of the UFS code; I put it in for
SunOS 4.1).

Flavors of UNIX with other file systems (e.g. the AIX 3.x journaling
file system, the SGI Extent File System, the Veritas journaling file
system, the Episode file system, etc.) may do that on those file systems
- with modern pluggable-file-system UNIXes, it's more of a question of
"which flavor of file system" than "which flavor of UNIX".