From owner-freebsd-hackers  Tue Dec 18  8:13:13 2001
Delivered-To: freebsd-hackers@freebsd.org
Received: from patan.sun.com (patan.Sun.COM [192.18.98.43])
	by hub.freebsd.org (Postfix) with ESMTP
	id 5B3AB37B405; Tue, 18 Dec 2001 08:13:07 -0800 (PST)
Received: from canadamail1.Canada.Sun.COM ([129.155.5.100])
	by patan.sun.com (8.9.3+Sun/8.9.3) with ESMTP id JAA02709;
	Tue, 18 Dec 2001 09:12:48 -0700 (MST)
Received: from opcom-mail.canada.sun.com (scot.Canada.Sun.COM [129.155.8.107])
	by canadamail1.Canada.Sun.COM (8.9.3+Sun/8.9.3/ENSMAIL,v2.1p1) with ESMTP id LAA01699;
	Tue, 18 Dec 2001 11:13:05 -0500 (EST)
Received: from zonzorp.canada.sun.com (zonzorp.Canada.Sun.COM [129.155.6.21])
	by opcom-mail.canada.sun.com (8.9.1b+Sun/8.9.1) with ESMTP id LAA12127;
	Tue, 18 Dec 2001 11:12:40 -0500 (EST)
Received: from zonzorp (oz@localhost)
	by zonzorp.canada.sun.com (8.9.3+Sun/8.9.3) with ESMTP id LAA26047;
	Tue, 18 Dec 2001 11:11:01 -0500 (EST)
Message-Id: <200112181611.LAA26047@zonzorp.canada.sun.com>
X-Mailer: exmh version 2.5 07/13/2001 with nmh-1.0
To: Terry Lambert <tlambert2@mindspring.com>
Cc: freebsd-fs@FreeBSD.ORG, freebsd-hackers@FreeBSD.ORG
Subject: Re: Instead of JFS, why not a whole new FS? 
In-Reply-To: Message from Terry Lambert <tlambert2@mindspring.com> 
   of "Mon, 17 Dec 2001 18:29:46 PST." <3C1EAA1A.CA49932@mindspring.com> 
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Date: Tue, 18 Dec 2001 11:11:00 -0500
From: "ozan s. yigit" <oz@zonzorp.canada.sun.com>
Sender: owner-freebsd-hackers@FreeBSD.ORG
Precedence: bulk
List-ID: <freebsd-hackers.FreeBSD.ORG>
List-Archive: <http://docs.freebsd.org/mail/> (Web Archive)
List-Help: <mailto:majordomo@FreeBSD.ORG?subject=help> (List Instructions)
List-Subscribe: <mailto:majordomo@FreeBSD.ORG?subject=subscribe%20freebsd-hackers>
List-Unsubscribe: <mailto:majordomo@FreeBSD.ORG?subject=unsubscribe%20freebsd-hackers>
X-Loop: FreeBSD.ORG

> Any FS that shares code with an existing FS will not flush out
> the full list of problems associated with writing a new FS in
> the context of a FreeBSD system.

how about an implementation of plan9's kfs? it is fairly simple, with
dentries similar to unix inodes, eg.

	typedef struct {
		char name[NAMELEN];
		short uid;
		short gid;
		ushort mode;
		short wuid;
		Qid qid;
		long size;
		long dblock[NDBLOCK];	/* 6 */
		long iblock;
		long diblock;
		long atime;
		long mtime;
	} Dentry;

and perhaps would make a good educational implementation. sources for
plan9's own is in plan9/sys/src/cmd/disk, if one needs to take a look.
the document "the plan9 file server" by thompson gives some detail.

oz
---
ozan s. yigit			staff engineer, sun microsystems/es
http://www.cs.yorku.ca/~oz	ozan.yigit@sun.com || +1 [905] 415 2878
---
narrowness of imagination leads to narrowness of experience. [corollary to rob]



To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-hackers" in the body of the message