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Importing a new version from external source
The middle layer is the format module, which does translation of
block device block numbers into image file block numbers. A simple format
module which is called "raw" is doing trivial 1:1 translation, same as
existing loop device. More sophisticated format module is keeping the
translation table and is able to dynamically grow and shrink the image
file. That means, if you create a container with 2GB of disk space,
the image file size will not be 2GB, but less -- the size of the actual
data stored in the container.
block device block numbers into image file block numbers. A simple format
module which is called "raw" is doing trivial 1:1 translation, same as
existing loop device. More sophisticated format module is keeping the
translation table and is able to dynamically grow and shrink the image
file. That means, if you create a container with 2GB of disk space,
the image file size will not be 2GB, but less -- the size of the actual
data stored in the container.