Re: btrfsck does not fix

[Hendrik Friedel <hendrik@friedels.name>]

Hello,

I was wondering whether I am doing something wrong in the way I am 
asking/what I am asking.
My understanding is, that btrfsck is not able to fix this error yet. So, 
I am surprised, that noone is interested in this, apparently?

Regards,
Hendrik Friedel

Am 07.01.2014 21:38, schrieb Hendrik Friedel:
> Hello,
>
>  >>>> I ran btrfsck on my volume with the repair option. When I re-run
> it, >>I get the same errors as before.
>> It mounts without errors? So why then btrfsck/btrfs repair? What
>> precipitated the repair?
>
> I don't know what caused the damage, but a check revealed this:
>
> Checking filesystem on /dev/sdb1
> UUID: 989306aa-d291-4752-8477-0baf94f8c42f
> checking extents
>
> Extent back ref already exists for 2994950590464 parent 863072366592 root 0
> Extent back ref already exists for 2994950836224 parent 863072366592 root 0
> Extent back ref already exists for 862762737664 parent 863072366592 root 0
> Extent back ref already exists for 2994950877184 parent 863072366592
> [...]
> Incorrect global backref count on 2995767250944 found 1 wanted 2
> backpointer mismatch on [2995767250944 4096]
> ref mismatch on [2995767304192 4096] extent item 1, found 2
> Incorrect global backref count on 2995767304192 found 1 wanted 2
> backpointer mismatch on [2995767304192 4096]
> ref mismatch on [2995768258560 4096] extent item 1, found 2
> Incorrect global backref count on 2995768258560 found 1 wanted 2
> backpointer mismatch on [2995768258560 4096]
> ref mismatch on [2995768459264 4096] extent item 1, found 2
> Incorrect global backref count on 2995768459264 found 1 wanted 2
> backpointer mismatch on [2995768459264 4096]
> Errors found in extent allocation tree or chunk allocation
>
> ref mismatch on [2995768459264 4096] extent item 1, found 2
> Incorrect global backref count on 2995768459264 found 1 wanted 2
> backpointer mismatch on [2995768459264 4096]
> Errors found in extent allocation tree or chunk allocation
> checking free space cache
> checking fs roots
> root 256 inode 9579 errors 100, file extent discount
> root 256 inode 9580 errors 100, file extent discount
> root 256 inode 14258 errors 100, file extent discount
> root 256 inode 14259 errors 100, file extent discount
> root 4444 inode 9579 errors 100, file extent discount
> root 4444 inode 9580 errors 100, file extent discount
> root 4444 inode 14258 errors 100, file extent discount
> root 4444 inode 14259 errors 100, file extent discount
> found 1993711951581 bytes used err is 1
> total csum bytes: 4560615360
> total tree bytes: 5643403264
> total fs tree bytes: 139776000
> total extent tree bytes: 263602176
> btree space waste bytes: 504484726
> file data blocks allocated: 6557032402944
>   referenced 6540949323776
> Btrfs v3.12
>
> This made me run btrfsck with the repair option:
>
>
> Extent back ref already exists for 2994950590464 parent 863072366592 root 0
>
> ref mismatch on [32935936 4096] extent item 1, found 2
> repair deleting extent record: key 32935936 168 4096
> adding new tree backref on start 32935936 len 4096 parent 2994784206848
> root 2994784206848
> Incorrect global backref count on 32935936 found 1 wanted 2
> backpointer mismatch on [32935936 4096]
> ref mismatch on [32997376 4096] extent item 1, found 2
> repair deleting extent record: key 32997376 168 4096
> adding new tree backref on start 32997376 len 4096 parent 2994824708096
> root 2994824708096
> Incorrect global backref count on 32997376 found 1 wanted 2
> backpointer mismatch on [32997376 4096]
>
> Incorrect global backref count on 8988365651968 found 1 wanted 0
> backpointer mismatch on [8988365651968 4096]
> repaired damaged extent references
> checking free space cache
> checking fs roots
> root 256 inode 9579 errors 100, file extent discount
> root 256 inode 9580 errors 100, file extent discount
> root 256 inode 14258 errors 100, file extent discount
> root 256 inode 14259 errors 100, file extent discount
> root 4444 inode 9579 errors 100, file extent discount
> root 4444 inode 9580 errors 100, file extent discount
> root 4444 inode 14258 errors 100, file extent discount
> root 4444 inode 14259 errors 100, file extent discount
> enabling repair mode
> Checking filesystem on /dev/sdc1
> UUID: 989306aa-d291-4752-8477-0baf94f8c42f
> cache and super generation don't match, space cache will be invalidated
> found 827360733827 bytes used err is 1
> total csum bytes: 4446455380
> total tree bytes: 5506977792
> total fs tree bytes: 137293824
> total extent tree bytes: 258691072
> btree space waste bytes: 496921489
> file data blocks allocated: 6440132583424
>   referenced 6424163344384
> Btrfs v3.12
>
>
> After this, I ran a check without the repair option again and the same
> errors persist.
>
> Greetings,
> Hendrik
>
>


-- 
Hendrik Friedel
Auf dem Brink 12
28844 Weyhe
Mobil 0178 1874363