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Bug 1521163 - [RFE] blkid can identify magic number and UUID of VDO volume
Summary: [RFE] blkid can identify magic number and UUID of VDO volume
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: util-linux
Version: 7.6
Hardware: Unspecified
OS: Unspecified
low
low
Target Milestone: rc
: ---
Assignee: Karel Zak
QA Contact: Radka Brychtova
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2017-12-05 22:02 UTC by Dennis Keefe
Modified: 2018-04-10 17:28 UTC (History)
4 users (show)

Fixed In Version: util-linux-2.23.2-49.el7
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2018-04-10 17:27:15 UTC
Target Upstream Version:
Embargoed:


Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2018:0936 0 None None None 2018-04-10 17:28:01 UTC

Description Dennis Keefe 2017-12-05 22:02:02 UTC
Description of problem:
VDO is a device mapper target with deduplication and compression features.
Until recently VDO did not have a magic number or UUID.  blkid support for VDO
is needed, so utilities using blkid can be informed that the a given storage device is being used by VDO.


Version-Release number of selected component (if applicable):


How reproducible:
100% can't identify VDO volumes
Create a VDO volume


Steps to Reproduce:
1. vdo create --name=vdo1 --device=/dev/sdb --vdoLogicalSize=10T
2. # blkid /dev/sdb


Actual results:
# blkid /dev/sdb
# <nothing>

Expected results:
# blkid /dev/sdb
# /dev/sdb: UUID="<string>" TYPE="VDO"

Additional info:

Comment 3 Sweet Tea Dorminy 2017-12-05 22:04:27 UTC
The magic number is the first 8 bytes, with value 'dmvdo001' of the volume; the UUID is the 16 bytes starting 40 bytes into the volume. I could probably draw up quickly a superblocks/vdo.c if desired.

Comment 4 Karel Zak 2017-12-06 09:53:42 UTC
(In reply to Sweet Tea Dorminy from comment #3)
> I could probably draw up quickly a superblocks/vdo.c if desired.

Thanks! It would be nice. The ideal solution is to prepare a patch for upstream tree:

   https://github.com/karelzak/util-linux

I'll backport it to RHEL7. See also libblkid/src/superblocks/lvm.c where are another DM targets, maybe we can add DM_VDO there.

It would be also nice to have a test image with the superblock (just dd(1) first sectors from the device).

Comment 5 Sweet Tea Dorminy 2017-12-07 01:29:23 UTC
https://github.com/karelzak/util-linux/pull/547

Comment 14 errata-xmlrpc 2018-04-10 17:27:15 UTC
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


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