Bug 1222963

Summary:	btrfs option --delete-qgroup unreliable
Product:	[openSUSE] openSUSE Tumbleweed	Reporter:	Arvin Schnell <aschnell>
Component:	Basesystem	Assignee:	David Sterba <dsterba>
Status:	RESOLVED FIXED	QA Contact:	E-mail List <qa-bugs>
Severity:	Normal
Priority:	P5 - None	CC:	aschnell, dsterba, wqu
Version:	Current
Target Milestone:	---
Hardware:	Other
OS:	Other
See Also:	https://bugzilla.suse.com/show_bug.cgi?id=1222847 https://bugzilla.suse.com/show_bug.cgi?id=972511
Whiteboard:
Found By:	Development	Services Priority:
Business Priority:		Blocker:	---
Marketing QA Status:	---	IT Deployment:	---

Description Arvin Schnell 2024-04-17 12:31:54 UTC

The btrfs option --delete-qgroup when deleting subvolumes is unreliable:

# btrfs subvolume create /test1/yls
Create subvolume '/test1/yls'
# btrfs quota rescan --wait /test1
quota rescan started
# btrfs subvolume delete --delete-qgroup /test1/yls
Delete subvolume 4804 (no-commit): '/test1/yls'
WARNING: unable to delete qgroup 0/0: Device or resource busy

Note: The qgroup in the warning is also wrong.

Comment 1 Wenruo Qu 2024-04-25 21:52:43 UTC

The design of --delete-qgroup doesn't take all the challenges of qgroup into consideration.

In fact, for most cases that options would not work at all.

I'm even considering reverting those patches.

Comment 2 David Sterba 2024-04-29 17:42:35 UTC

Yeah, the option does not work as expected and will be removed upstream.

Comment 3 David Sterba 2024-05-09 10:44:53 UTC

The option has been removed in released btrfs-progs 6.8.1. There's work in progress to do the deletion properly, either in kernel in or in progs.