bcachefs: respect superblock discard flag.

We were accidentally using default mount options and overwriting the
discard flag.

Signed-off-by: Daniel Hill <daniel@gluo.nz>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Daniel Hill 2022-03-05 17:45:27 +13:00 • committed by Kent Overstreet
commit 102a6a8f69