Re: quotas: failure on removing a file via SFTP/SSH

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

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On 2017年11月21日 20:08, ST wrote:
> Hello,
> 
> I'm trying to use quotas for a simple chrooted sftp setup, limiting
> space for each user's subvolume (now for testing to 1M).
> 
> I tried to hit the limit by uploading files and once it comes to the
> limit I face following problem: if I try to free space by removing a
> file via Linux sftp client (or Filezilla) - I get error:
> "Couldn't delete file: Failure"
> 
> Sometimes, but not always, if I repeat it for 3-5 times it does removes
> the file at the end.
> If I login as root and try to remove the file via SSH I get the error:
> "rm: cannot remove 'example.txt': Disk quota exceeded"
> 
> What is the problem? And how can I solve it?

Kernel version first.

If it's possible, please use latest kernel, at least newer than v4.10,
since we have a lot of qgroup reservation related fixes in newer kernel.

Then, for small quota, due to the nature of btrfs metadata CoW and
relative large default node size (16K), it's quite easy to hit disk
quota for metadata.

So it's not really useful for such small quota usage.
If you really want to use quota for small limit, at least use small
nodesize.

And if you hit -EDQUOTA, normally you could try to sync the fs to free
some reserved space, then try again.

Thanks,
Qu
> 
> Thank you in advance!
> 
> 
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