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説明
for files on supporting filesystems, we have the SEEK_HOLE/SEEK_DATA api.
but this does not apply to block devices, we need something else to detect unused blocks in these.
For block devices, sometimes another API is supported:
- nbd: BLOCK_STATUS, see e.g.: https://github.com/xapi-project/vhd-tool/blob/master/scripts/get_nbd_extents.py
- (add other APIs)
Since recently, borg fixed blocksize chunker can accept a sparse map / file map, but there is no way yet to build that map for a block device.
Related to #14.