In 6.9.1, is there a way to disable the "discard=async" mount option on my btrfs SSD cache?   /etc/mtab says: /dev/sdf1 on /mnt/cache type btrfs (rw,noatime,space_cache=v2,discard=async)   I have a crash issue that I am trying to nail down and I'd like to briefly turn off TRIM.