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Subject: bug#18660: Partprobe and advanced format disks
Resent-From: Nuzhna Pomoshch <nuzhna_pomoshch@HIDDEN>
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Date: Mon, 6 Oct 2014 22:06:45 -0700
From: Nuzhna Pomoshch <nuzhna_pomoshch@HIDDEN>
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Partprobe is a fantastically useful too. It is absolutely
vital to access new partitions without rebooting, as
well as easily get to partitions on a mapped device.

However, I am having a large problem with it now
on a 4096 byte sector hard drive.

All of the filesystem tools work fine on the raw
device. However, since I want encryption (AND
separate partitions), I did:

# cryptsetup -v luksFormat /dev/sdx

WARNING!
=3D=3D=3D=3D=3D=3D=3D=3D
This will overwrite data on /dev/sdd irrevocably.

Are you sure? (Type uppercase yes): YES
Enter passphrase:=20
Verify passphrase:=20
Command successful.

# cryptsetup open /dev/sdx disk
Enter passphrase for /dev/sdx:

# ls -al /dev/mapper/
total 0
drwxr-xr-x  2 root root     120 2014-10-07 03:35:21 ./
drwxr-xr-x 17 root root    5480 2014-10-07 03:35:21 ../
crw-------  1 root root 10, 236 2014-07-28 15:33:13 control
lrwxrwxrwx  1 root root       7 2014-10-07 03:35:21 disk -> ../dm-0

# gdisk /dev/mapper/disk
GPT fdisk (gdisk) version 0.8.10

Partition table scan:
  MBR: not present
  BSD: not present
  APM: not present
  GPT: not present

Creating new GPT entries.

Command (? for help): n
Partition number (1-128, default 1): 1
First sector (6-732566127, default =3D 256) or {+-}size{KMGTP}:=20
Last sector (256-732566127, default =3D 732566127) or {+-}size{KMGTP}: +8G
Current type is 'Linux filesystem'
Hex code or GUID (L to show codes, Enter =3D 8300):=20
Changed type of partition to 'Linux filesystem'

Command (? for help): w

Final checks complete. About to write GPT data. THIS WILL OVERWRITE EXISTIN=
G
PARTITIONS!!

Do you want to proceed? (Y/N): y
OK; writing new GUID partition table (GPT) to /dev/mapper/disk.
Warning: The kernel is still using the old partition table.
The new table will be used at the next reboot.
The operation has completed successfully.

# gdisk -l /dev/mapper/disk
GPT fdisk (gdisk) version 0.8.10

Partition table scan:
  MBR: protective
  BSD: not present
  APM: not present
  GPT: present

Found valid GPT with protective MBR; using GPT.
Disk /dev/mapper/disk: 732566133 sectors, 2.7 TiB
Logical sector size: 4096 bytes
Disk identifier (GUID): AF876611-E58D-481A-8836-3FF2CBF581D3
Partition table holds up to 128 entries
First usable sector is 6, last usable sector is 732566127
Partitions will be aligned on 256-sector boundaries
Total free space is 730468970 sectors (2.7 TiB)

Number  Start (sector)    End (sector)  Size       Code  Name
   1             256         2097407   8.0 GiB     8300  Linux filesystem

# /usr/sbin/partprobe

# ls -al /dev/mapper/
total 0
drwxr-xr-x  2 root root      140 2014-10-07 04:39:33 ./
drwxr-xr-x 17 root root     5500 2014-10-07 04:39:33 ../
crw-------  1 root root  10, 236 2014-07-28 15:33:13 control
lrwxrwxrwx  1 root root        7 2014-10-07 04:39:33 disk -> ../dm-0
brw-------  1 root root 253,   3 2014-10-07 04:39:33 disk1

# mke2fs -b 4096 -L disk -m 0 -v /dev/mapper/disk1
mke2fs 1.42.10 (18-May-2014)
fs_types for mke2fs.conf resolution: 'ext2'
Filesystem label=3Ddisk
OS type: Linux
Block size=3D4096 (log=3D2)
Fragment size=3D4096 (log=3D2)
Stride=3D0 blocks, Stripe width=3D0 blocks
65536 inodes, 262144 blocks
0 blocks (0.00%) reserved for the super user
First data block=3D0
Maximum filesystem blocks=3D268435456
8 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Filesystem UUID: 678b1ec9-9442-4af2-936b-e353a886b227
Superblock backups stored on blocks:=20
        32768, 98304, 163840, 229376

Allocating group tables: done                           =20
Writing inode tables: done                           =20
Writing superblocks and filesystem accounting information: done

# mount /dev/mapper/disk1 /mnt/disk/

# df
[...]
/dev/mapper/disk1    1032088      1284   1030804   1% /mnt/disk

# dd bs=3D1048576 if=3D/dev/zero of=3D/mnt/disk/file
dd: error writing =E2=80=98/mnt/disk/file=E2=80=99: No space left on device
1006+0 records in
1005+0 records out
1054507008 bytes (1.1 GB) copied, 24.6156 s, 42.8 MB/s

# df
[...]
/dev/mapper/disk1  1032088   1032088         0 100% /mnt/disk

I could show the results of more tools, but you get the idea -
there is only 1 GB of the 8 GB partition available. I suspect
(but don't know for certain) that partprobe is not passing
the correct parameters to the device mapper.

Thanks in advance for your help.

Nuzhna

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Nuzhna Pomoshch <nuzhna_pomoshch@HIDDEN>
Subject: bug#18660: Acknowledgement (Partprobe and advanced format disks)
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Subject: bug#18660: Partprobe and advanced format disks
Resent-From: "Brian C. Lane" <bcl@HIDDEN>
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On Mon, Oct 06, 2014 at 10:06:45PM -0700, Nuzhna Pomoshch wrote:
> Partprobe is a fantastically useful too. It is absolutely
> vital to access new partitions without rebooting, as
> well as easily get to partitions on a mapped device.
> 
> However, I am having a large problem with it now
> on a 4096 byte sector hard drive.

You left out the most important tool :) What does the output from:

parted -s /dev/mapper/disk u s p

show?


-- 
Brian C. Lane | Anaconda Team | IRC: bcl #anaconda | Port Orchard, WA (PST8PDT)

Message sent to bug-parted@HIDDEN:

Subject: bug#18660: Partprobe and advanced format disks
References: <1412658405.35592.YahooMailBasic@HIDDEN>
Resent-From: Nuzhna Pomoshch <nuzhna_pomoshch@HIDDEN>
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Date: Mon, 10 Nov 2014 22:05:56 -0800
From: Nuzhna Pomoshch <nuzhna_pomoshch@HIDDEN>
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On Wed, 10/8/14, Brian C. Lane <bcl@HIDDEN> wrote:

> Subject: bug#18660: Partprobe and advanced format disks
> To: 18660 <at> debbugs.gnu.org
> Date: Wednesday, October 8, 2014, 6:25 PM
> 
> On Mon, Oct 06, 2014 at 10:06:45PM -0700, Nuzhna Pomoshch wrote:
> > Partprobe is a fantastically useful too. It is absolutely
> > vital to access new  partitions without rebooting, as
> > well  as easily get to partitions on a mapped device.
> > 
> > However, I am having  a large problem with it now
> > on a 4096  byte sector hard drive.
> 
> You left out the most important tool :) What does the output  from:
> 
> parted -s /dev/mapper/disk u s p
> 
> show?

Replied to you a month ago, but (following up) it seems
that I am supposed to reply to the specific bug number
(that was not clear to me before - this is the first time
I have filed a bug here). Anyway,

# parted -s /dev/mapper/disk u s p
Model: Linux device-mapper (crypt) (dm)
Disk /dev/mapper/disk: 732566133s
Sector size (logical/physical): 4096B/4096B
Partition Table: gpt
Disk Flags: 

Number  Start  End       Size      File system  Name              Flags
 1      256s   2097407s  2097152s               Linux filesystem

As I think I mentioned before (via command output),
parted does see the disk having 4096 byte sectors.
My guess (I haven't looked at the code, and I don't
even know how much I could learn from doing so - I
am not a programmer at all, and probably would not
understand much, if anything) is that partprobe (and
the libraries behind it) is just passing the sectors
above to the device mapper (which uses 512 byte
sectors exclusively) without making the necessary
adjustment for the larger sector size.

This would confirm that (again, these are 512 byte
sectors):

# dmsetup table disk1
0 2097152 linear 253:2 256

Nuzhna

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On 11/11/2014 1:05 AM, Nuzhna Pomoshch wrote:
> This would confirm that (again, these are 512 byte sectors):
> 
> # dmsetup table disk1 0 2097152 linear 253:2 256

Are you using parted 3.2, or an older version?


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