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Description of problem:
The node-name is stored in a static 32 byte array, thus all node-names provided to commands which create BDSes are silently truncated to 31 characters.
The limitation does not seem to be documented besides
Version-Release number of selected component (if applicable):
current upstream
How reproducible:
100%
Steps to Reproduce:
1. use blockdev-add to create a BDS with "node-name": "migration-drive-virtio-disk1-storage"
2. call query-named-block-nodes
Actual results:
Node name is reported as "node-name": "migration-drive-virtio-disk1-st"
Expected results:
blockdev commands fail if the node name would be truncated, the limit is documented in the schema
Additional info:
making it unlimited is another option, but rather useless for libvirt, since it will need to stick to the limit
Comment 2Miroslav Rezanina
2018-07-24 14:15:37 UTC
Tested on qemu-kvm-rhev-2.12.0-8.el7.x86_64:
{"execute": "blockdev-add","arguments": {"node-name": "migration-drive-virtio-disk1-storage","driver": "raw", "file": {"driver":"file", "filename": "/root/test.raw"}}}
{"error": {"class": "GenericError", "desc": "Node name too long"}}
Hi Kevin,
QE did not find where the node name character limit is documented except in iotests, is there any place I missing ?
Else, QE think it's better to document the character limit or we could print the info in the error.
Thanks.
Though not directly related to the bug, this is a valid criticism for upstream. I sent a patch upstream, but I don't think we'll backport it for 7.6 (especially since only libvirt is supported as an external interface). Instead, we'll get the documentation improvement with the next rebase.
Does this sound good to you?
(In reply to Kevin Wolf from comment #5)
> Though not directly related to the bug, this is a valid criticism for
> upstream. I sent a patch upstream, but I don't think we'll backport it for
> 7.6 (especially since only libvirt is supported as an external interface).
> Instead, we'll get the documentation improvement with the next rebase.
>
> Does this sound good to you?
Thanks Kevin, that sounds good to me.
Based on comment 4 and comment 5, set this bug to 'VERIFIED'.
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-2018:3443