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Looks like my manpage of fallocate(1) command line tool is out of date. There is the appropriate option --punch-hole (-p): fallocate -p -o 10G -l 1G qqq


This tool written in C may be helpful for you. It is not a standard tool, but it is very simple and easy to compile. You are right that cp doesn't support sparse output to block devices (confirmed in man page).

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