linux-kernel - Re: [PATCH] scsi/sd: Fix size output in MB

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Date:	Sat, 30 Aug 2008 23:24:29 +0100
From:	Simon Arlott <simon@...e.lp0.eu>
To:	Pierre Ossman <drzeus-list@...eus.cx>
CC:	James Bottomley <James.Bottomley@...senPartnership.com>,
	Matthew Wilcox <matthew@....cx>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-scsi <linux-scsi@...r.kernel.org>
Subject: Re: [PATCH] scsi/sd: Fix size output in MB

On 30/08/08 23:13, Pierre Ossman wrote:
> On Sat, 30 Aug 2008 16:45:49 -0500
> James Bottomley <James.Bottomley@...senPartnership.com> wrote:
> 
>> On Sat, 2008-08-30 at 22:59 +0200, Pierre Ossman wrote:
>> > On Sat, 30 Aug 2008 11:45:16 -0600
>> > Matthew Wilcox <matthew@....cx> wrote:
>> > 
>> > > 
>> > > 2. We should report in GB or TB when appropriate.  The exact definition
>> > > of 'appropriate' is going to vary from person to person.  Might I
>> > > suggest that we should report between two and four significant digits.
>> > > eg 9543 MB is ok, 10543 MB should be 10 GB.
>> > > 
>> > 
>> > I've been looking at doing something like this for the mmc_block
>> > driver, so a generic helper is welcome. :)
>> 
>> Does MMC have the 10^3 requirement like SCSI/ATA disks do, or can you
>> use 2^10 like standard computer stuff for capacities?
>> 
> 
> Some do, some don't. I prefer the 2^10 and MiB variants as it avoids
> ambiguity.

If there's a generic function to do this, there could be a Kconfig option 
to select the variant (10^3 MB, 2^10 MiB, 2^10 MB ;)), as long as the byte 
value is available from the same message.

-- 
Simon Arlott
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