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Description of problem:

When using lvm2 with 16GB (max size) of thin-pool metadata, several operations are not combining well together.

It is allowed to create bigger metadata LV then the size accepted by kernel which does require to not pass bigger device - otherwise messages are thrown back to user from kernel.

Problem could be easily seen when user is passing 16GB LV to thin_restore and then using this 'restored' LV  via lvconvert as a thin-pool metadata LV.


Version-Release number of selected component (if applicable):
2.02.169

How reproducible:


Steps to Reproduce:
1.
2.
3.

Actual results:


Expected results:


Additional info:

Solved also in stable-2.02 patch set:

https://www.redhat.com/archives/lvm-devel/2021-February/msg00015.html
https://www.redhat.com/archives/lvm-devel/2021-February/msg00017.html
https://www.redhat.com/archives/lvm-devel/2021-February/msg00016.html

Introduce   allocation/thin_pool_crop_metadata  with default value 0

If users wants 'cropping' to 15.81GiB he must set the value =1 - otherwise new lvm2 will use full available amount for thin-pool allocation 15.88GiB.