cfdisk UI problem with a small partition starting and ending before sector 2048 (1MiB)

cfdisk UI problem with a small partition starting and ending before sector 2048 (1MiB)

[Peter Cordes]

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I tested sfdisk/cfdisk from the latest git while setting up a new disk.
It finds some free space where there isn't any:


                          Disk: /dev/sde
     Size: 2.7 TiB, 3000592982016 bytes, 5860533168 sectors
  Label: gpt, identifier: 7E471862-5089-4C54-A3BC-722ADD08808A
					       
Device           Start        End              Sectors  Size Type
/dev/sde1           40       2047                 2008 1004K BIOS boot
Free space        2048         39 18446744073709549608   16E
/dev/sde2         2048   30722047             30720000 14.7G Linux RAID
...


sfdisk --dump dumps/restores it just fine.  (Thanks fixing that bug last
year with sfdisk refusing to create the boot partition starting at
sector 40.)

Here's the dump so you can recreate it easily:

label: gpt
label-id: 7E471862-5089-4C54-A3BC-722ADD08808A
device: /dev/sde
unit: sectors
first-lba: 34
last-lba: 5860533134

/dev/sde1 : start=          40, size=        2008, type=21686148-6449-6E6F-744E-656564454649, uuid=336580CD-6D34-4148-8708-DB3308CE667C, name="BIOS boot partition"
/dev/sde2 : start=        2048, size=    30720000, type=A19D880F-05FC-4D3B-A006-743F0F84911E, uuid=A3F01280-2490-4925-B2D7-4A31F0B8556A
/dev/sde3 : start=    30722048, size=      614400, type=0657FD6D-A4AB-43C4-84E5-0933C84B4F4F, uuid=B07E3680-FC7E-4BE3-A14A-568011F9D410
/dev/sde4 : start=    31336448, size=   134217728, type=A19D880F-05FC-4D3B-A006-743F0F84911E, uuid=CA777D0F-0DA2-4F9C-98D8-67187479BA81
/dev/sde5 : start=   165554176, size=   209715200, type=A19D880F-05FC-4D3B-A006-743F0F84911E, uuid=C7C67ABA-9483-4FF7-9D96-5BC37BED19FF
/dev/sde6 : start=   375269376, size=  5485263759, type=A19D880F-05FC-4D3B-A006-743F0F84911E, uuid=FE8DFE27-11B1-438B-BA24-0CD64B474897



-- 
#define X(x,y) x##y
Peter Cordes ;  e-mail: X(peter@cor , des.ca)

"The gods confound the man who first found out how to distinguish the hours!
 Confound him, too, who in this place set up a sundial, to cut and hack
 my day so wretchedly into small pieces!" -- Plautus, 200 BC

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Re: cfdisk UI problem with a small partition starting and ending before sector 2048 (1MiB)

[Karel Zak]

On Sat, Feb 27, 2016 at 12:19:55AM -0400, Peter Cordes wrote:
> I tested sfdisk/cfdisk from the latest git while setting up a new disk.
> It finds some free space where there isn't any:

 Fixed by commit b362a4cb986f7eea4b884c800719971502e2e8a8.

 Note that technically there is a free space between sectors 34 and
 40, but after align to MiBs it's useless and libfdisk code has been
 confused with it...

    Karel

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