linux-ext4 - Re: [PATCH] e2fsprogs: Fix how we treat user-spcified filesystem size

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Message-ID: <AANLkTimRMnceeWpTy6A3h_pEYLq_meAwjOHNOojmhuJR@mail.gmail.com>
Date:	Tue, 1 Feb 2011 16:57:51 -0500
From:	Greg Freemyer <greg.freemyer@...il.com>
To:	Andreas Dilger <adilger@...ger.ca>
Cc:	Lukas Czerner <lczerner@...hat.com>, linux-ext4@...r.kernel.org,
	tytso@....edu
Subject: Re: [PATCH] e2fsprogs: Fix how we treat user-spcified filesystem size

On Tue, Feb 1, 2011 at 3:37 PM, Andreas Dilger <adilger@...ger.ca> wrote:
> On 2011-02-01, at 12:18, Lukas Czerner wrote:
>> +Optionally, the
>> +.I filesystem-size
>> +parameter may be suffixed by one of the following the units
>> +designators: 'b', 's', 'K', 'M', or 'G',
>> +for blocks count, 512 byte sectors, kilobytes, megabytes, or gigabytes,
>> +respectively.
>
> My reading of parse_num_blocks() shows that 'T' is also accepted as a suffix for terabytes, which I was otherwise going to suggest be added, since this is the normal size for filesystems today.  It might be worthwhile _briefly_ mentioning here that these are binary/power-of-two values and not decimal values, instead of the rant further below.
>
> Minor technical nit - the proper metric value is lower-case 'k' for kilo, though the upper-case 'M', 'G', and 'T' are correct for mega-, giga-, and terabytes.

<pedantic>
If they are powers of 2, they are: kibibytes, mebibytes, gibibytes,
and tebibytes.

See the chart on the right of: http://en.wikipedia.org/wiki/Kibibyte

Many linux tools have already moved to these names and abbreviations.
(TiB not TB, etc.)
<\pedantic>

Greg
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