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Date: Fri, 30 Jan 1998 05:31:25 +1100
From: Bruce Evans <bde@zeta.org.au>
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To: bde@zeta.org.au, daniel_sobral@voga.com.br
Subject: Re: cvs commit: src/sys/i386/isa wfd.c
Cc: cvs-all@FreeBSD.ORG, cvs-committers@FreeBSD.ORG, cvs-sys@FreeBSD.ORG,
        mike@smith.net.au
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>> There should also be a cdevsw function to give the
>> "best" i/o size.
>
>I agree with that. Having an ioctl to do it is awkward.

Especially a nonexistent ioctl.  The DIOCGPART ioctl only works for
partitions with type FS_BSDFFS and a nonzero fragment size and count
in their partition table entry.  newfs(8) used to initialize these
entries but this was broken a few years ago.  You can still initialize
these entries using disklabel(8), although this is bogus for partitions
that don't have ufs filesystem on them.  This sometimes happens by
accident because /etc/disktab specifies such entries.  BTW, how is
tc (type specify for partition c) disambiguated from tc (termcap
capabilities)?  The former should never be used, for reasons not
related to termcap.

Bruce