Re: Stuck subvolume removal:

[Qu Wenruo <wqu@suse.com>]

在 2026/1/28 19:12, Paul Graff 写道:
[...]
>> Unfortunately btrfs-progs doesn't have the ability to repair it yet, 
>> I'll craft a branch of btrfs-progs with the repair ability soon.
>>
>> Meanwhile please prepare an environment to compile btrfs-progs.
>>
>> Thanks,
>> Qu
> 
> Hi, I would like to ask if there is a solution to the "dropped ghost 
> subvolume" the filesystem on machine here exhibits as of yet?

My bad, forgot to inform you about the fix.

In fact the fix is already merged into btrfs-progs, but not yet included 
in any release.

If you can compile btrfs-progs, please fetch and compile the latest 
devel branch:

https://github.com/kdave/btrfs-progs/tree/devel

After compiling the devel branch, you can use `btrfs check --repair` to 
fix the problem, which will add back the missing orphan item for those 
ghost subvolumes.

Thanks,
Qu

> 
> -Thanks
> 
> Paul Graff
> 
>>
>>>
>>> [6/7] checking root refs (0:00:01 elapsed, 94 items checked)
>>>
>>> ERROR: errors found in root refs
>>>
>>> found 496776130741 bytes used, error(s) found
>>>
>>> total csum bytes: 465839608
>>>
>>> total tree bytes: 16133832704
>>>
>>> total fs tree bytes: 14983905280
>>>
>>> total extent tree bytes: 624771072
>>>
>>> btree space waste bytes: 3613129770
>>>
>>> file data blocks allocated: 1062495817728
>>>
>>> referenced 976540409856
>>>
>>> :~ #
>>>
>>>
>>>>
>>>> Thanks,
>>>> Qu
>>>>
>>> -Greatest Hopes
>>> Paul
>>>>>
>>>>> After passing,
>>>>>
>>>>> |:~> sudo btrfs subvolume sync / [sudo] password for root: 
>>>>> hightower- i5-6600k:~> |
>>>>>
>>>>> the command returned to prompt very, very quickly.
>>>>>
>>>>> A second balance attempt results with the following output:
>>>>>
>>>>> |:~> sudo btrfs balance start / WARNING: Full balance without 
>>>>> filters requested. This operation is very intense and takes 
>>>>> potentially very long. It is recommended to use the balance filters 
>>>>> to narrow down the scope of balance. Use 'btrfs balance start -- 
>>>>> full-balance' option to skip this warning. The operation will start 
>>>>> in 10 seconds. Use Ctrl-C to stop it. 10 9 8 7 6 5 4 3 2 1 Starting 
>>>>> balance without any filters. ERROR: error during balancing '/': 
>>>>> Structure needs cleaning There may be more info in syslog - try 
>>>>> dmesg | tail hightower- i5-6600k:~> |
>>>>>
>>>>> |:~> dmesg | tail [93689.781162] [ T69656] BTRFS info (device 
>>>>> dm-2): found 16 extents, stage: update data pointers [93690.667290] 
>>>>> [ T69656] BTRFS info (device dm-2): relocating block group 
>>>>> 1495819878400 flags data [93703.323923] [ T69656] BTRFS info 
>>>>> (device dm-2): found 33 extents, stage: move data extents 
>>>>> [93705.575991] [ T69656] BTRFS info (device dm-2): found 33 
>>>>> extents, stage: update data pointers [93706.769453] [ T69656] BTRFS 
>>>>> info (device dm-2): relocating block group 1494746136576 flags data 
>>>>> [93725.570642] [ T69656] BTRFS info (device dm-2): found 39 
>>>>> extents, stage: move data extents [93727.449779] [ T69656] BTRFS 
>>>>> info (device dm-2): found 39 extents, stage: update data pointers 
>>>>> [93728.465650] [ T69656] BTRFS info (device dm-2): relocating block 
>>>>> group 60294168576 flags metadata|dup [93736.722689] [ T69656] BTRFS 
>>>>> error (device dm-2): cannot relocate partially dropped subvolume 
>>>>> 490, drop progress key (853588 108 0) [93750.594559] [ T69656] 
>>>>> BTRFS info (device dm-2): balance: ended with status: -117 
>>>>> hightower- i5-6600k:~> |
>>>>>
>>>>> Please see the following referenced, prior posting for stuck 
>>>>> subvolume removal similarity. https://lore.kernel.org/linux- 
>>>>> btrfs/9f936d59- d782-1f48-bbb7-dd1c8dae2615@gmail.com/
>>>>>
>>>>> Is there a patch for btrfsprogs? If so can the patch be merged?|
>>>>> |
>>>>>
>>>>> What are your thoughts on this?
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>
>>>
>>
>