bcachefs: Add extra verbose logging for ro path

Also log time waiting for c->writes references to be dropped; this will
help in debugging why unmounts are taking longer than they should.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2023-11-22 18:30:43 -05:00
commit e7f7ddedd6