Date: 20 Nov 1996 09:57 EST From: "barry (b.a.) scott" <tsbarry@nortel.ca> To: hackers@freebsd.org Cc: jdli@freebsd.csie.nctu.edu.tw, joerg_wunsch@uriah.heep.sax.de, akiyama@kme.mei.co.jp, barry@scottb.demon.co.uk, john@talisker.demon.co.uk, jgumb@madge.com Subject: 640MB MO support source kit Message-ID: <199611201540.HAA11847@freefall.freebsd.org>
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Introduction
============
This kit contains changes to "FreeBSD 2.2-961006-SNAP"
which implement support for disks with physical sector
size of 512, 1024 and 2048 bytes.
Authors: These changes are the joint effort of
John Gumb (john@talisker.demon.co.uk) and
Barry Scott (barry@scottb.demon.co.uk). Please
contact us about these chanages.
At this point only the od device has been changed.
Changing the sd device would be straight forward;
apply the changes from od.c to sd.c. We will submit
a patch for sd.c later.
This kit contains diffs that can be used with the 'patch'
utility to update a virgin source tree.
Location: via ftp at ftp.freebsd.org:/pub/FreeBSD/incoming/mo-2048kit.tar.gz
1. Source Changes necessary
========================
a) SBIN changes
------------
Patch file: sbin.MO.patch
This file patches fdisk and newfs to support up to
2048 byte sectors.
Files changed on system:
/usr/src/sbin/newfs/newfs.c
/usr/src/sbin/newfs/mkfs.c
/usr/src/sbin/i386/fdisk/fdisk.c
Corresponding files in this kit:
mo-kit/sbin.MO.patch
mo-kit/sbin/newfs/newfs.c
mo-kit/sbin/newfs/mkfs.c
mo-kit/sbin/i386/fdisk.c
b) SYS chages
----------
Patch file sys.MO.patch
This file patches the kernel to support up to 2048
byte sectors on the od device. Both ufs and msdosfs
are supported on the od device.
Files changed on system:
/usr/src/sys/msdosfs/msdosfs_fat.c
/usr/src/sys/msdosfs/msdosfs_vfsops.c
/usr/src/sys/msdosfs/msdosfsmount.h
/usr/src/sys/kern/subr_diskslice.c
/usr/src/sys/ufs/ufs/ufs_disksubr.c
/usr/src/sys/scsi/od.c
Corresponding files in this kit:
mo-kit/sys.MO.patch
mo-kit/sys/msdosfs/msdosfs_fat.c
mo-kit/sys/msdosfs/msdosfs_vfsops.c
mo-kit/sys/msdosfs/msdosfsmount.h
mo-kit/sys/kern/subr_diskslice.c
mo-kit/sys/ufs/ufs/ufs_disksubr.c
mo-kit/sys/scsi/od.c
c) ETC changes
-----------
The file disktab.MO contains the disktab entry for the
Fujitsu M2513A MO drive with 2048 byte media.
Files changed on system:
/etc/disktab
Corresponding file in this kit:
mo-kit/disktab.MO
2. Testing performed
=================
a) MSDOS
-----
For MSDOS FS we created a FAT formated MO disk under Windows NT
and placed files onto the disk from Windows NT.
Under FreeBSD all the directories and files where confirmed
to be readable.
Under FreeBSD we created extra directories and wrote files
on to the MO disk.
FreeBSD could read these additional files.
The disk was moved back to Windows NT and chkdsk was used
to detect any file system corrupt. None found. Window NT
was used to read the directories and files written under
FreeBSB.
b) UFS
---
we use the following script to regression test
disklabel and newfs:
-------------
#!/bin/bash
set -x
echo Initing disk...
umount /dev/od0a
umount /dev/od0s1
logger -p local1.notice "Initing disk..."
dd bs=2048 count=1 if=od0-mbr.fdisk of=/dev/rod0
dd bs=2048 count=2 seek=1 if=/dev/zero of=/dev/rod0
echo read disklabel...
logger -p local1.notice "read disklabel before write..."
disklabel /dev/rod0c
echo read disklabel...
logger -p local1.notice "read disklabel -r before write..."
disklabel -r /dev/rod0c
echo write disklabel...
logger -p local1.notice "write disklabel..."
disklabel -r -w /dev/rod0c m2513a-640mb testing-mo-code
echo read disklabel after write...
logger -p local1.notice "read disklabel..."
disklabel /dev/rod0c
echo newfs od0a
logger -p local1.notice "newfs..."
newfs /dev/rod0a
echo mount od0a
logger -p local1.notice "mount od0a..."
mount /mo
-------------
Note the file od0-mbr.fdisk contains a copy of the mbr
written previously under FreeBSD by the new fdisk.
The entire /usr/src/sys tree was written to the MO disk
using cp -r. The disk was dismounted and then remounted.
Then the entire /usr/src/sys tree was diffed against the
MO disk copy. No differences found.
The MO was dismounted and fsck was run. It detected no
problems.
3. Misc. Information
=================
a) FDISK
-----
We have tended to create a single BSD slice using fdisk. Be
aware that the slice should start at offset 1 and the file
system size should be 310351 sectors; the first sector being
reserved for the mbr/partition table information. The geometry
we use is slightly different to the default (see our modified
/etc/disktab) in order to utilise the full capacity of the media.
The bios geometry we use is C/H/S 652/17/28 (652*17*28=310352).
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