[TUHS] moving directories in svr2

[Noel Chiappa]

    > From: Bakul Shah

    > My guess is *not* storing a path instead of a ptr to the inode was done
    > to save on memory.

More probably speed; those old disks were not fast, and on a PDP-11, disk
caches were so small that converting the path to the current directory to its
in memory inode could take a bunch of disk reads.

    > Every inode has a linkcount so detecting when the last conn. is severed
    > not a problem.

Depends; if a directory _has_ to be empty before it can be deleted, maybe; but
if not, no. (Consider if /a/b/c/d exists, and /a/b is removed; the tree
underneath it has to be walked and the components deleted. That could take a
while...) In the general case (e.g. without the restriction to a tree), it's
basically the same problem as garbage collection in LISP.

	  Noel