Re: How to repair errors only found with check --mode=lowmem

[Qu Wenruo <quwenruo.btrfs@gmx.com>]

[-- Attachment #1.1: Type: text/plain, Size: 3181 bytes --]



On 2017年12月16日 23:41, Tom Hale wrote:
> The following shows that errors are found with check --mode=lowmem, but
> are not picked up without lowmem.

Btrfs-progs version please.

Depending on your btrfs-progs version, and the output, it's possible
that they're just false alerts and should be addressed in latest version.

Thanks,
Qu

> 
> How would I go about fixing errors only reported by lowmem?
> 
> ----------------------------------------
> 
> [manjaro manjaro]# btrfs check --mode=lowmem --progress
> /dev/mapper/vg_svelte-home
> Checking filesystem on /dev/mapper/vg_svelte-home
> UUID: 93722fa7-7e8f-418a-a7ca-080aca8db94b
> ERROR: extent[691815358464, 11042816] referencer count mismatch (root:
> 257, owner: 1869679, offset: 613974016) wanted: 1, have: 2
> ERROR: extent[720156536832, 99430400] referencer count mismatch (root:
> 257, owner: 758215, offset: 1610616832) wanted: 8, have: 379
> ERROR: extent[720669147136, 268435456] referencer count mismatch (root:
> 257, owner: 758215, offset: 4096) wanted: 86, have: 1021
> ERROR: extent[720669147136, 268435456] referencer count mismatch (root:
> 257, owner: 1767807, offset: 4096) wanted: 87, have: 1021
> ERROR: extent[726724722688, 64069632] referencer count mismatch (root:
> 257, owner: 1480823, offset: 99090432) wanted: 1, have: 5
> ERROR: extent[737910194176, 134217728] referencer count mismatch (root:
> 257, owner: 1480726, offset: 268435456) wanted: 1, have: 8
> ERROR: extent[738077896704, 134217728] referencer count mismatch (root:
> 257, owner: 1869696, offset: 402653184) wanted: 5, have: 8
> ERROR: extent[744334426112, 268435456] referencer count mismatch (root:
> 257, owner: 1767802, offset: 0) wanted: 111, have: 294
> ERROR: extent[824948670464, 1671168] referencer count mismatch (root:
> 257, owner: 2000876, offset: 247861248) wanted: 16, have: 26
> ERROR: data extent[681550843904 8192] backref lost
> ERROR: errors found in extent allocation tree or chunk allocation
> cache and super generation don't match, space cache will be invalidated
> ERROR: errors found in fs roots
> found 172094545920 bytes used, error(s) found
> total csum bytes: 165679768
> total tree bytes: 3066789888
> total fs tree bytes: 2751315968
> total extent tree bytes: 112295936
> btree space waste bytes: 568660274
> file data blocks allocated: 8158426562560
>  referenced 597269540864
> [manjaro manjaro]# btrfs check --repair  --progress
> /dev/mapper/vg_svelte-home
> enabling repair mode
> Checking filesystem on /dev/mapper/vg_svelte-home
> UUID: 93722fa7-7e8f-418a-a7ca-080aca8db94b
> checking extents [.]
> Fixed 0 roots.
> cache and super generation don't match, space cache will be invalidated
> checking fs roots [o]
> checking csums
> checking root refs
> found 172091723777 bytes used, no error found
> total csum bytes: 165679768
> total tree bytes: 2003206144
> total fs tree bytes: 1687732224
> total extent tree bytes: 112295936
> btree space waste bytes: 346177995
> file data blocks allocated: 5952940838912
>  referenced 474676633600
> [manjaro manjaro]#
> 
> ----------------------------------------
> 


[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 520 bytes --]