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Date: Tue, 18 Apr 1995 22:19:33 -0700
From: Julian Elischer <julian>
Message-Id: <199504190519.WAA06359@freefall.cdrom.com>
To: fs, hackers, hardware
Subject: [DEVFS] your opinions sought!
Sender: hardware-owner@FreeBSD.org
Precedence: bulk

I am about ready to let people hack at devfs.
but one thing I'm not sure about:

what is a good way for the devfs to appear?

I personally favour something hierachical,
such as:

/devices/disks/sd0/all
/devices/disks/sd0/FAT/all	/* I suppose it could be called C: */
/devices/disks/sd0/BSD/all
/devices/disks/sd0/BSD/a
/devices/disks/sd0/BSD/b
/devices/disks/sd0/BSD/c
/devices/disks/sd0/99/all	/* MACH but not recognised */
/devices/disks/sd0/DOSX/all
/devices/disks/sd0/DOSX/A
/devices/disks/sd0/DOSX/B
/devices/disks/sd1/all
/devices/disks/sd1/BSD/all
/devices/disks/sd1/BSD/b
/devices/disks/sd1/BSD/c
/devices/disks/sd1/BSD/d
/devices/disks/wd0/all
/devices/disks/wd0/BSD/all
/devices/disks/wd0/BSD/a

but maybe the following might be as good: (same disk)
(P=PARTITION, S=SLICE)

/devices/sd0
/devices/sd0P0
/devices/sd0P1
/devices/sd0P1Sa
/devices/sd0P1Sb
/devices/sd0P1Sc
/devices/sd0P2
/devices/sd0P3
/devices/sd0P3Sa
/devices/sd0P3Sb
/devices/sd1
/devices/sd1P0
/devices/sd1
/devices/sd1Sa	/* no MBR? */
/devices/sd1Sb
/devices/sd1Sc
/devices/wd0
/devices/wd0P0Sa


Whichever scheme is chosen, I expect a  link (or symlink) from
/devices/scsi/bus0/targ0/lun0/all->/devices/disks/sd0/all
or something similar
e.g.
/devices/scsi/b0t0l0 -> ../../disks/sd0  (?)
or
/devices/scsi/b0t0l0_all hardlink to /devices/sd0  (?)
/devices/scsi/b0t0l0_P0 hardlink to /devices/sd0P0  (?)
/devices/scsi/b0t0l0_P1Sa hardlink to /devices/sd0P1Sa  (?)

remember:
you can only hardlink devices not directories
you can symlink anything but it takes a longer lookup sequence.
(also symlinks are not supported yet)

julian