I have been testing CLS with btrfs. It had been working fine. The last time I booted my /var/calculate/home/ directory was missing.
The following dmesg errors appeared:
[ 3.133115] BTRFS error (device nvme0n1p1): unrecognized mount option ‘ssdspace_cache’
[ 3.284490] BTRFS error (device nvme0n1p3): unrecognized mount option ‘ssdspace_cache’
[ 3.284502] BTRFS error (device nvme0n1p3): open_ctree failed
After some research, I discovered these errors in fstab:
UUID=5a7edd6d-fb07-4207-a072-65b1045d7b35 / btrfs noatime,ssdspace_cache 0 1
UUID=875ec864-a7ca-4d12-bda6-673f7a5a35bf /var/calculate btrfs noatime,ssdspace_cache 0 0
The problem is that ssdspace_cache should be ssd,space_cache. I did not modify fstab. Some how is was booting like that for a couple of weeks then all of a sudden those 2 partitions didn’t mount. Maybe btrfs was ignoring those errors before.
Putting in the commas fixes the problem.