Subject: Re: RFC: new mode bits in stat structure
To: None <tech-kern@NetBSD.ORG>
From: Wolfgang Rupprecht <firstname.lastname@example.org>
Date: 06/26/1998 09:35:07
email@example.com (Jason Thorpe) writes:
> For the HSM we're building on NetBSD/alpha, I need a couple of additional
> mode bits to indicate two separate additional file states:
> - File has been archived
> - File is not resident on disk
Just a few quick observations.
1) The flag bits method is not truly heirarchical. It only allows a
2-level storage system.
2) The mod-time, size etc. information of the disk and background
storage can't both be presented as the same time.
When I think "heirarchical" my mental pricture is of something like
the union-filesystem with an arbitrary number of layers. eg:
The stat structure would perhaps return a new integer field, the
filesytem layer-number that this stat structure element referred to.
Wolfgang Rupprecht <firstname.lastname@example.org>