Generic driver displays incorrect cinder volume capacity

[Duy Nguyen]

Hello team,

Description
===========

I will manila with generic driver + ceph cinder volume. When I create 1 file share 10G and mount nfs from client. Check with command df -h then mount path displays incorrect size.

On instance server:
/dev/sdb 9.8G 24K 9.3G 1% /shares/6ae1bfcb-a23e-4734-83a8-fda6e39115af

On client mount nfs:
192.168.0.5:/shares/6ae1bfcb-a23e-4734-83a8-fda6e39115af 9.8G 256K 9.3G 1% /mnt/data

Expected result
===============
I have checked with file code generic.py and function _format_device()

def _format_device(self, server_details, volume):
        """Formats device attached to the service vm."""
        self._is_device_file_available(server_details, volume)
        command = ['sudo', 'mkfs.%s' % self.configuration.share_volume_fstype,
                   volume['mountpoint']]
        self._ssh_exec(server_details, command)

and I have read 1 topic as below :
https://askubuntu.com/questions/1348780/why-is-my-disk-size-reduced-after-creating-an-ext4-partition

So I hope we can add command tune2fs after format partition for volume.

This problem maybe not bug on system but i still hope we have update it in next time

Thanks you team

[Vida Haririan (vhariria)]

See additional triage information at https://meetings.opendev.org/meetings/manila/2024/manila.2024-04-25-15.00.log.html