Rockstor "ERROR: can't list qgroups: quotas not enabled"

phillxnet · April 22, 2018, 7:55pm

@Flox Hello again.

Don’t know but Rockstor does make some (still incomplete) efforts to account for snapshots via size calculations based on the following command:

btrfs qgroup show /mnt2/share2/

called in the following function:

github.com

rockstor/rockstor-core/blob/master/src/rockstor/fs/btrfs.py#L1072-L1087


      
          and
          :param pool_mnt_pt: Pool (vol) mount point, ie: settings.MNT_PT/pool.name
          :param share_name: share/snap.name
          :return: dict indexed by snap name with tuple values of:
          (qgroup, writable) where qgroup = 0/subvolid and writable = Boolean.
          """
          # -p = show parent ID, -u = uuid of subvol, -q = parent uuid of subvol
          o, e, rc = run_command([BTRFS, "subvolume", "list", "-u", "-p", "-q", pool_mnt_pt])
          subvol_id = share_uuid = None
          for l in o:
              if re.match("ID ", l) is not None:
                  fields = l.split()
                  if fields[-1].replace("@/", "", 1) == share_name:
                      subvol_id = fields[1]
                      share_uuid = fields[12]
          if subvol_id is None:

Also those warning log entries are normal and we do need to improve our quota re-scans a little bit, see @Flyer’s:

https://github.com/rockstor/rockstor-core/issues/1624

Yes, that’s the one; and I don’t think it’s changed: at least for a goodly while:

github.com

rockstor/rockstor-core/blob/master/src/rockstor/fs/btrfs.py#L776-L796


      
                  mnt_cmd = [MOUNT, mnt_device, root_pool_mnt]
                  if len(mnt_options) > 0:
                      mnt_cmd.extend(["-o", mnt_options])
                  try:
                      run_command(mnt_cmd)
                      return root_pool_mnt
                  except Exception as e:
                      if device.name == last_device.name:
                          # exhausted mounting using all devices in the pool
                          raise e
                      logger.error(
                          "Error mounting: {}. "
                          "Will try using another device.".format(mnt_cmd)
                      )
                      logger.exception(e)
              else:
                  logger.error("Device ({}) was not found".format(mnt_device))
          raise Exception(
              "Failed to mount Pool({}) due to an unknown reason. "
              "Command used {}".format(pool.name, mnt_cmd)
          )

Not sure if you are still running 3.9.2-11 (that you reported in another forum thread we are both in) but there have been a number of improvements in the quota / size calculation area of things since then, including the ability to disable and re-enable quotas on a pool:

I was able to copy the work done by @ganti_priya on using inline edit in other areas of the UI for this feature which was handy. Thanks Priyanka.

And upon re-enabling quotas a fresh quota rescan is auto initiated. So that might be of interest. That post includes a pic of where this feature was put in the UI and a rough guide on it’s expected behaviour.

But there are known limitations / bugs still existing in how we calculate size but we are getting better at it. I have planned another session on this area of the code but it may take me a while to get to it as there are a few more pressing Rockstor engagements for me to tack first.

Hope that helps and do keep in mind that it can take several minutes for a quota rescan to complete and while it is on going Rockstor will display ‘interim’ values that are obviously incomplete.