creating a cascaded linear devices fails

["Eli Malul" <eli.malul@xxxxxxxxxxxxx>]

I do not understand why creating a linear device and then trying to create another linear device on top of it fails.

1.       Creating a linear device over loop1:
===========================
dmsetup create linear_loop1 /tmp/linear_loop1

cat /tmp/linear_loop1
0 1000 linear /dev/loop1 0

2.       Then creating another linear device over this linear device:
=============================================
dmsetup create linear_loop2 /tmp/linear_loop2

device-mapper: reload ioctl failed: Invalid argument
Command failed

cat /tmp/klinear_loop2
0 1000 linear /dev/linear_loop1 0

 

Could you please explain what am I doing wrong?

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