GNU bug report logs - #20909
incorrect partition size calculation

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Phil Susi <psusi <at> ubuntu.com>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#20909: closed (incorrect partition size calculation)
Date: Thu, 02 Jul 2015 18:04:02 +0000

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Your message dated Thu, 02 Jul 2015 14:02:14 -0400
with message-id <55957CA6.7000201 <at> ubuntu.com>
and subject line Re: bug#20909: incorrect partition size calculation
has caused the debbugs.gnu.org bug report #20909,
regarding incorrect partition size calculation
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


-- 
20909: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=20909
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From: Gena Makhomed <gmm <at> csdoc.com>
To: bug-parted <at> gnu.org
Subject: incorrect partition size calculation
Date: Sat, 27 Jun 2015 05:19:03 +0300

Hello, All!

incorrect partition size calculation

# parted -v
parted (GNU parted) 2.3

Model: ATA HGST HUS724040AL (scsi)
Disk /dev/sda: 7814037168s

how to reproduce:

parted -s /dev/sda mklabel gpt
parted -s /dev/sda -a none mkpart primary 34s 2047s
parted -s /dev/sda set 1 bios_grub on
parted -s /dev/sda mkpart primary 2048s 2099199s
parted -s /dev/sda set 2 raid on
parted -s /dev/sda mkpart primary 2099200s 102764543s
parted -s /dev/sda set 3 raid on
parted -s /dev/sda mkpart primary zfs 102764544s 7814037134s

parted
(parted) unit s
(parted) print free
Model: ATA HGST HUS724040AL (scsi)
Disk /dev/sda: 7814037168s
Sector size (logical/physical): 512B/512B
Partition Table: gpt

Number  Start       End          Size         File system  Name     Flags
 1      34s         2047s        2014s                     primary 
bios_grub
 2      2048s       2099199s     2097152s                  primary  raid
 3      2099200s    102764543s   100665344s                primary  raid
 4      102764544s  7814037134s  7711272591s               primary

(parted)

=======================================

parted reports what /dev/sda4 partition has size of 7711272591s
but this is not true, partition size is 7711272590s:

7814037168 - 2014 -  2097152 - 100665344 - 34 - 34 == 7711272590

P.S.

sorry, I can't find bugzilla for parted and can't check
what this bug for parted was previously reported and fixed.

-- 
Best regards,
 Gena

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From: Phil Susi <psusi <at> ubuntu.com>
To: 20909-done <at> debbugs.gnu.org
Subject: Re: bug#20909: incorrect partition size calculation
Date: Thu, 02 Jul 2015 14:02:14 -0400

On 6/29/2015 2:37 PM, Gena Makhomed wrote:
>> You are off by 1. start and end are inclusive so the size of sda4 is:
>>
>> 1 + (7814037134 - 102764544) = 7711272591
>>

Closing for this reason.

> BTW, "start and end are inclusive" - IMHO is very bad decision,
> because now it is not possible to partition disk using MiB units
> and always need use sectors and make all calculations manually.

No.. MiB units work just fine.

> for example, parted -s /dev/sda mkpart primary 34s 1MiB
> now use one sector from second MiB and next partition
> will be created as unaligned.

No, it doesn't... the partition ends on sector 2047, so the next 
partition can start on sector 2048.

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