Re: Strange behavior with scrub, quotas, and snapshots

[Qu Wenruo <wqu@suse.com>]

在 2026/4/28 12:03, brainchild 写道:
> With swap disabled, the scrub operation seems to reach completion, with no errors found.
>   
> However, the check operation still discovers the same errors.

Scrub is not a fsck, from man page of btrfs-scrub:

Note:
         Scrub is not a filesystem checker (fsck, btrfs-check(8)). It 
can only detect filesystem damage using the checksum validation, and it 
can only repair filesystem damage by copying from other known good replicas.

         btrfs-check(8) performs more exhaustive checking and can 
sometimes be used, with expert guidance, to rebuild certain corrupted 
filesystem structures in the absence of any good replica.


>   
> The output of `rescue fix-device-size' is "No device size related problem found".
>   
> After, check still reports the same errors, including the super mismatch.

If you do not want to manually fix the nbytes mismatch, go "btrfs check 
--repair", which may also help to fix the super block size mismatch.