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On 02/16/2012 06:30 PM, Ted Ts'o wrote:

Sorry, I'm still not understanding what you're concerned about.  The
last write should seek to the end of the file system, and write a
single byte --- which would be past the last hole.  The goal is to
make sure the file system is large enough that e2fsck doesn't
complain about the file system image being apparently too small.

That single byte write doesn't happen when sparse == 0.

I don't understand why you're saying that it's not writing anything
beyond the last hole, and why you're saying i_size is not being
updated.  It's working for me; I can run e2fsck on the generated
image, and it's not complaining that the file system is too small.

It works for you because sparse != 0, thus triggering that one byte write.

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