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SubjectRe: How to start on new db-based FS?
Hans Reiser wrote:
> Daniel Mose wrote:
> >I'm doing a scan on the web for disk storage layout documentation on
> >different file systems. I have I think, downloaded just about all
> >there is to download on www.namesys.com, but I fail to find anything
> >that does describe the reiserfs storage layout in any detail.
> >Is there such documentation available?

I do believe that I've been somewhat unclear. What I would hope
to find is :
Documentation of On-disk Per-partition storage layout
of file lookup and maintainance structures for reiserfs.

> >I would be very happy for directions to it in this case.
> >
> >Reason? I want to know if the root file system that I my self is
^^^^^^^^^^^^^^^^
Correction, Should be: File system for root mountable partitions.

> >about to develop perhaps is already implemented to some extent in
> >any existing root FS:s ?
^^^^^^^^^
same correction here.

> What is a root filesystem? (I am accustomed to the term as describing
> what the OS uses for storing the semantic layer's root directory).

I do not have a CS - convention, or Unix background, so I am a bit
unfamiliar with terms like "semantic layer's root directory"
I am a "learn by doing" type of guy, and up to now it has worked out
ok.
There seems to be a lot of discrepancies when it comes to
defining what a "file system" really is. I often find that the
term is used with widely different meanings, depending on who
you are actually talking to, and also in what context it is used.

I believe that the developers at www.oss.sgi, as well as the JFS
developers hosted at IBM, use the term: "root file system" to make
clear that

A. It is a Unix type of file system, that can be used as "/"
at boot, i e a system "magically" mountable root partition.

B. The file system occupies a Local mountable disk partition,
and is acessible via the Unix mount command.

C. The file system is used for file access, and maintainance of
On-disk file-lookup hierarchies, such as one or more
Superblocks, File allocation scheemes ( f ex allocation group
descriptors,block and inode bitmap tables, as well as inodes )
and Directory files ( ext2fs or FFS )

I hope that this makes a bit more sense to you.
Thank you for taking time with me, all the same

I'm happy for any further direction.

kind regards
Daniel Mose
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