Implemented LoopDevice::set_block_size().

[koutheir]

Implemented LoopDevice::set_block_size() which wraps ioctl(LOOP_SET_BLOCK_SIZE) to set the block size of the loop device.

I put the implementation behind a new feature block_size because the flag LOOP_SET_BLOCK_SIZE requires Linux kernel version 4.14 or higher.

[packit-as-a-service]

Congratulations! One of the builds has completed. 🍾

You can install the built RPMs by following these steps:

• sudo dnf install -y 'dnf*-command(copr)'
• dnf copr enable packit/stratis-storage-loopdev-3-97-copr_pull
• And now you can install the packages.

Please note that the RPMs should be used only in a testing environment.