bcachefs: Journal pins must always have a flush_fn

flush_fn is how we identify journal pins in debugfs - this is a
debugging aid.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2023-11-09 13:19:00 -05:00
commit 3eedfe1af9
4 changed files with 40 additions and 20 deletions