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Description of problem:
The wipefs command is printing duplicate gpt clear messages. When the command is run, it's actually clearing the primary gpt, the backup gpt, and the PMBR.
- Is this command expected to clear the PMBR? I saw in bug 1054186, PMBR added in, but that is for expected use with '-a', not '-a -t <type>'. If it is expected, we should be getting a print message for the PMBR being cleared.
- Is that extra gpt print message the tool actually clearing the PMBR and printing the wrong message?
Version-Release number of selected component (if applicable):
kenrel-3.10.0-693.el7.x86_64
util-linux-2.23.2-43.el7.x86_64
Reproduction:
[root@localhost ~]# parted -s /dev/sdg mklabel gpt
[root@localhost ~]# parted -s /dev/sdg mkpart primary 0% 100%
[root@localhost ~]# parted /dev/sdg u s p
Model: QEMU QEMU HARDDISK (scsi)
Disk /dev/sdg: 4194304s
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags:
Number Start End Size File system Name Flags
1 2048s 4192255s 4190208s primary
[root@localhost ~]# hexdump -C /dev/sdg | egrep 'EFI PART|55 aa'
000001f0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 55 aa |..............U.|
00000200 45 46 49 20 50 41 52 54 00 00 01 00 5c 00 00 00 |EFI PART....\...|
7ffffe00 45 46 49 20 50 41 52 54 00 00 01 00 5c 00 00 00 |EFI PART....\...|
Note the extra print:
[root@localhost ~]# wipefs -a -t gpt /dev/sdg
/dev/sdg: 8 bytes were erased at offset 0x00000200 (gpt): 45 46 49 20 50 41 52 54
/dev/sdg: 8 bytes were erased at offset 0x7ffffe00 (gpt): 45 46 49 20 50 41 52 54
/dev/sdg: 8 bytes were erased at offset 0x7ffffe00 (gpt): 45 46 49 20 50 41 52 54
/dev/sdg: calling ioclt to re-read partition table: Success
And the lack of PMBR:
[root@localhost ~]# hexdump -C /dev/sdg | egrep 'EFI PART|55 aa'
[root@localhost ~]#
Actual results:
Duplicate print messages for GPT label and no reference to PMBR.
Expected results:
If PMBR removal is expected, there should be a print for removal. Duplicate print for GPT should be removed.
This is bug, PMBR should not be affected if "-t gpt" specified.
Fixed by upstream commit 0e45b256ac41257e920e1bcf61ff1a1b30ba5b98. This bugfix should be definitely backported to RHEL7.5.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHBA-2018:0936