I want to relate two related LUKS-related puzzles.
Puzzle 1: Finding where a LUKS device is mapped.
I have a device that is known to be LUKS formatted. Let's call it
/dev/sda3. I verify that it is LUKS formatted as follows:
> cryptsetup isLuks /dev/sda3
> echo $?
0
Now I want to find out whether it's open. My first guess is to look in
/dev/mapper, and sure enough, there are multiple devices in there that
could be candidates.
> ls -l /dev/mapper
total 0
crw-rw---- 1 root root 10, 59 2010-08-07 11:39 control
brw-rw---- 1 root disk 252, 0 2010-08-09 17:11
udisks-luks-uuid-6497d53d-5413-4368-80eb-bef311497fb6-uid2343
brw-rw---- 1 root disk 252, 0 2010-08-09 17:15
udisks-luks-uuid-54779533-1245-1234-5efb-1dcb3ac3def-uid1371
How can I tell which of the two /dev/mapper devices corresponds to
/dev/sda3?
Puzzle 2: The Reverse
I have a mountpoint, /mnt/foo, that I think might be mounted to a LUKS
device. I use 'df' to find where it's mounted, as follows:
> df -h /mnt/foo
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/udisks-luks-uuid-6497d53d-5413-4368-80eb-bef311497fb6-uid2343
236M 2.1M 222M 1% /mnt/foo
That looks like a candidate to me. How do I find out which physical
device that comes from?
Thanks in advance!
--Dave
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