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Date: Fri, 1 Dec 1995 04:20:05 -0800
Message-Id: <199512011220.EAA19492@freefall.freebsd.org>
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From: Bruce Evans <bde@zeta.org.au>
Subject: Re: bin/854: swapinfo shows incorrect information for vnconfig'd swap.
Reply-To: Bruce Evans <bde@zeta.org.au>
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The following reply was made to PR bin/854; it has been noted by GNATS.

From: Bruce Evans <bde@zeta.org.au>
To: FreeBSD-gnats-submit@freebsd.org, jkh@mimsy.cdrom.com
Cc:  Subject: Re: bin/854: swapinfo shows incorrect information for vnconfig'd swap.
Date: Fri, 1 Dec 1995 23:06:21 +1100

 >On a system with swap space added via vnconfig, swapinfo prints an
 >entry like this for the vn0 device:
 
 >/dev/??         65536        0    65472     0%    Interleaved
 
 >>How-To-Repeat:
 
 >        dd if=/dev/zero of=/usr/swapfile bs=4k count=16384
 >        vnconfig /dev/vn1 /usr/swapfile
                          ^0
 >        swapon /dev/vn1
                        ^0
 
 This is probably because you don't have /dev/vn0b and/or because you
 didn't specify swapping on the `b' partition.  Unless slicing is enabled,
 the slice _and_ partition bits in the minor number are ignored, so
 /dev/vn0 is a bogus alias for /dev/vn0b and swapping on /dev/vn0 may
 work for bogus reasons.
 
 If slicing is enabled, then vnsize() is broken - it returns the full
 size, not the partition size.
 
 Bruce