FWIW, my workaround is putting a few lines in late_commands section of curtin_userdata:
[/etc/maas/preseeds/curtin_userdata]
late_commands: ...
# LP: #1709284 20_lp1709284: curtin in-target -- sed -i -e 's/\(bcache.* xfs\) defaults/\1 noatime,inode64/' /etc/fstab
FWIW, my workaround is putting a few lines in late_commands section of curtin_userdata:
[/etc/maas/ preseeds/ curtin_ userdata]
late_commands:
...
# LP: #1709284
20_lp1709284: curtin in-target -- sed -i -e 's/\(bcache.* xfs\) defaults/\1 noatime,inode64/' /etc/fstab