Re: [rfc] Near-constant time directory index for Ext2

From: Jeremy Jackson (
Date: Tue Feb 20 2001 - 16:08:48 EST

> In article <01022020011905.18944@gimli>,
> Daniel Phillips <> wrote:
> >Earlier this month a runaway installation script decided to mail all its
> >problems to root. After a couple of hours the script aborted, having
> >created 65535 entries in Postfix's maildrop directory. Removing those
> >files took an awfully long time. The problem is that Ext2 does each
> >directory access using a simple, linear search though the entire
> >directory file, resulting in n**2 behaviour to create/delete n files.
> >It's about time we fixed that.

In the case of your script I'm not sure this will help, but:
I've seen /home directories organised like /home/a/adamsonj,
/home/a/arthurtone, /home/b/barrettj, etc.
this way (crude) indexing only costs areas where it's needed,
without kernel modification. (app does it) What other placed would we
need indexing *in* the filesystem?

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This archive was generated by hypermail 2b29 : Fri Feb 23 2001 - 21:00:23 EST