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List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: Stuck subvolume removal: To: Paul Graff , linux-btrfs@vger.kernel.org References: <1c371732-db4f-49ad-bc00-876b3be0fe98@gmx.com> Content-Language: en-US From: Qu Wenruo Autocrypt: addr=quwenruo.btrfs@gmx.com; keydata= xsBNBFnVga8BCACyhFP3ExcTIuB73jDIBA/vSoYcTyysFQzPvez64TUSCv1SgXEByR7fju3o 8RfaWuHCnkkea5luuTZMqfgTXrun2dqNVYDNOV6RIVrc4YuG20yhC1epnV55fJCThqij0MRL 1NxPKXIlEdHvN0Kov3CtWA+R1iNN0RCeVun7rmOrrjBK573aWC5sgP7YsBOLK79H3tmUtz6b 9Imuj0ZyEsa76Xg9PX9Hn2myKj1hfWGS+5og9Va4hrwQC8ipjXik6NKR5GDV+hOZkktU81G5 gkQtGB9jOAYRs86QG/b7PtIlbd3+pppT0gaS+wvwMs8cuNG+Pu6KO1oC4jgdseFLu7NpABEB AAHNIlF1IFdlbnJ1byA8cXV3ZW5ydW8uYnRyZnNAZ214LmNvbT7CwJQEEwEIAD4CGwMFCwkI BwIGFQgJCgsCBBYCAwECHgECF4AWIQQt33LlpaVbqJ2qQuHCPZHzoSX+qAUCZxF1YAUJEP5a sQAKCRDCPZHzoSX+qF+mB/9gXu9C3BV0omDZBDWevJHxpWpOwQ8DxZEbk9b9LcrQlWdhFhyn xi+l5lRziV9ZGyYXp7N35a9t7GQJndMCFUWYoEa+1NCuxDs6bslfrCaGEGG/+wd6oIPb85xo 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UtKXm0mX6Kq3Ht3uzuz34tzfae0fyw8HOF+yNNZt4BY0t7E =E5=9C=A8 2025/11/14 09:10, Paul Graff =E5=86=99=E9=81=93: > Hi, currently there is a dropped subvolume error when running a full=20 > balance on a single SSD. >=20 > |:~> sudo btrfs balance start / WARNING: Full balance without filters=20 > requested. This operation is very intense and takes potentially very=20 > long. It is recommended to use the balance filters to narrow down the=20 > scope of balance. Use 'btrfs balance start --full-balance' option to=20 > skip this warning. The operation will start in 10 seconds. Use Ctrl-C to= =20 > stop it. 10 9 8 7 6 5 4 3 2 1 Starting balance without any filters.=20 > ERROR: error during balancing '/': Structure needs cleaning There may be= =20 > more info in syslog - try dmesg | tail hightower-i5-6600k:~> dmesg |=20 > tail [38576.407681] [ T29728] BTRFS info (device dm-2): found 37170=20 > extents, stage: update data pointers [38584.873805] [ T29728] BTRFS info= =20 > (device dm-2): relocating block group 64891125760 flags data=20 > [38607.693519] [ T29728] BTRFS info (device dm-2): found 33194 extents,= =20 > stage: move data extents [38641.574032] [ T29728] BTRFS info (device=20 > dm-2): found 33194 extents, stage: update data pointers [38649.812477]= =20 > [ T29728] BTRFS info (device dm-2): relocating block group 62710087680= =20 > flags data [38662.710999] [ T29728] BTRFS info (device dm-2): found=20 > 43884 extents, stage: move data extents [38696.292982] [ T29728] BTRFS= =20 > info (device dm-2): found 43884 extents, stage: update data pointers=20 > [38708.587669] [ T29728] BTRFS info (device dm-2): relocating block=20 > group 60294168576 flags metadata|dup [38714.889735] [ T29728] BTRFS=20 > error (device dm-2): cannot relocate partially dropped subvolume 490,=20 > drop progress key (853588 108 0) [38723.736887] [ T29728] BTRFS info=20 > (device dm-2): balance: ended with status: -117 hightower-i5-6600k:~>| The format is a mess. Please provide a proper formatted dmesg instead. Along with the kernel version. The relocation is rejected because there is a half-dropped subvolume,=20 which is not that common. It maybe a problem with the fs that there are some ghost subvolumes that= =20 are never dropped. There used to be kernel bug that can lead to such ghost subvolumes, IIRC= =20 the latest btrfs check can detect it. So please also provide the output of "btrfs check --readonly" of the=20 unmounted fs. Thanks, Qu >=20 > After passing, >=20 > |:~> sudo btrfs subvolume sync / [sudo] password for root: hightower-=20 > i5-6600k:~> | >=20 > the command returned to prompt very, very quickly. >=20 > A second balance attempt results with the following output: >=20 > |:~> sudo btrfs balance start / WARNING: Full balance without filters=20 > requested. This operation is very intense and takes potentially very=20 > long. It is recommended to use the balance filters to narrow down the=20 > scope of balance. Use 'btrfs balance start --full-balance' option to=20 > skip this warning. The operation will start in 10 seconds. Use Ctrl-C to= =20 > stop it. 10 9 8 7 6 5 4 3 2 1 Starting balance without any filters.=20 > ERROR: error during balancing '/': Structure needs cleaning There may be= =20 > more info in syslog - try dmesg | tail hightower-i5-6600k:~> | >=20 > |:~> dmesg | tail [93689.781162] [ T69656] BTRFS info (device dm-2):=20 > found 16 extents, stage: update data pointers [93690.667290] [ T69656]= =20 > BTRFS info (device dm-2): relocating block group 1495819878400 flags=20 > data [93703.323923] [ T69656] BTRFS info (device dm-2): found 33=20 > extents, stage: move data extents [93705.575991] [ T69656] BTRFS info=20 > (device dm-2): found 33 extents, stage: update data pointers=20 > [93706.769453] [ T69656] BTRFS info (device dm-2): relocating block=20 > group 1494746136576 flags data [93725.570642] [ T69656] BTRFS info=20 > (device dm-2): found 39 extents, stage: move data extents [93727.449779]= =20 > [ T69656] BTRFS info (device dm-2): found 39 extents, stage: update data= =20 > pointers [93728.465650] [ T69656] BTRFS info (device dm-2): relocating= =20 > block group 60294168576 flags metadata|dup [93736.722689] [ T69656]=20 > BTRFS error (device dm-2): cannot relocate partially dropped subvolume= =20 > 490, drop progress key (853588 108 0) [93750.594559] [ T69656] BTRFS=20 > info (device dm-2): balance: ended with status: -117 hightower-=20 > i5-6600k:~> | >=20 > Please see the following referenced, prior posting for stuck subvolume= =20 > removal similarity. https://lore.kernel.org/linux-btrfs/9f936d59-=20 > d782-1f48-bbb7-dd1c8dae2615@gmail.com/ >=20 > Is there a patch for btrfsprogs? If so can the patch be merged?| > | >=20 > What are your thoughts on this? >=20 >=20 >=20 >=20 >=20