mount -a will ensure everything in
/etc/fstab is mounted (except for
noauto entries). Is there an equivalent for cryptsetup, which will unlock everything in
No, not on current Debian Jessie Systems.
Reading the functions called from
/etc/init.d/cryptsetup (/lib/cryptsetup/cryptdisk.functions), I can see, that the init-script uses
read to read individual lines, which are then processed further (= mounted) by the script.
This result will most likely apply to all current Linux distributions.