On 01/05/2018 10:09 AM, Lukáš Pohanka wrote:
I was trying to create |dm-crypt| target from a partition using the
following command:
|dmsetup create target_name --table "1 $DEV_SZ crypt aes-xts-plain64
abababab...ab 0 /dev/sdb1 0"|
where |$DEV_SZ| is the total sector count of |/dev/sdb1| minus 1. In
other words, I want the DM to just skip the first sector on |/dev/sdb1|
(as I want to use that sector of sdb1 for a different purpose).
However, I got error:
|device-mapper: table: 253:0: crypt: Gap in table device-mapper: ioctl:
error adding target to table |
Is it possible for the device mapper to skip the first sector, or it
simply always has to start at 0?
It's possible. You've just slightly mixed offsets in your table.
Here's the correct one:
dmsetup create target_name --table "0 $DEV_SZ crypt aes-xts-plain64
> abababab...ab 0 /dev/sdb1 1"
(the first offset is in fact offset in dm table, hence the error message
about gap in table. the second offset after /dev/sdb1 device is offset
in that device)
Regards
O.
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