[Bug 278440] [UFS] unxz makes a file which reports wrong usage block size by /usr/bin/du

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=278440

--- Comment #3 from Marek Zarychta <zarychtam@plan-b.pwste.edu.pl> ---
(In reply to uratan from comment #2)

If it's not a bug, then please consider closing this PR.

Generally, the file is sparse if the file size in bytes (st_size) is larger
than the number of blocks allocated for the file (st_blocks) multiplied by
filesystem blocksize. These values can be checked with stat(1) (stat -f "%z %b"
file). Usually, UFS blocksize is 512.
However, the aforementioned values concerning the notion of sparseness can look
differently on compressed filesystems like ZFS.

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