This adds a new argument (-k) to cmd_unlock for specifying the keyring
to add to. The default is user, but user_session and session can also be
specified.
Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
Factor out bch2_pick_bucket_size() from the format code, and pick the
bucket size before picking the superblock location - that way we can
ensure the superblock gets its own bucket and doesn't trigger warnings
due to the allocation code noticing different types of data in the same
bucket.
