>But anyway it's interesting why the resulting sparse 
>files have different size on different fs?

That looks like a bug.  Assuming you didn't see any seeks or writes fail, 
the file size on all filesystems should be 2^56 + 4.  I suspect this is 
beyond the maximum file size allowed by the filesystem in some cases, so 
the write isn't happening, which means you should get a failure return 
code.

In the results you showed, the filesize ends up being a little less than 
2^48, which is not a place that you wrote ever.

--
Bryan Henderson                          IBM Almaden Research Center
San Jose CA                              Filesystems
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