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Date: Tue, 10 Jul 2012 11:56:40 +0200
From: Karel Zak <kzak@redhat.com>
To: kerolasa@gmail.com
Cc: Bernhard Voelker <mail@bernhard-voelker.de>,
        util-linux <util-linux@vger.kernel.org>
Subject: Re: [pull] /run directory and swapon
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On Thu, Jun 28, 2012 at 10:06:35AM +0200, Sami Kerola wrote:
> sake@sake /home/src/util-linux ./swapon --show --bytes
> NAME      TYPE            SIZE USED PRIO
> /dev/dm-0 partition 7999582208    0   -1
> 
> sake@sake /home/src/util-linux ./lsblk -I 252 --bytes	# why I did not
> get output?
> sake@sake /home/src/util-linux ./lsblk --bytes | grep 252
> | `-cryptswap1 (dm-0) 252:0    0   7999586304  0 crypt [SWAP]
> 
> Still differs?  But which one is right?

Both is right, because size of swap area != size of the device. The
first page (e.g. 4096 bytes) on the device is swap header. The area
could be also reduced by bad blocks or by mkswap <size> option.

 7999586304 - 7999582208 = 4096

    Karel

-- 
 Karel Zak  <kzak@redhat.com>
 http://karelzak.blogspot.com