XFS supports "holes". But we created file 100mb with 0 only in it, and it's
actual size was 100mb, for zeros this support doesn't work. We created other
file wrote some bytes at the beggining then did seek ~1GB and wrote to the end
couple more bytes. XFS was showing it's size of 1GB, but actual size of it on
the disc was only few bytes, that's called "HOLE" as I understand. But it
doesn't work for 0s, if you write a big ammount of zeros. What we have to do,
to write an add-on that would work for zeros, but problemm is we can't find any
good enough specification. We could dig over whole source that was being
written several years, and VERY badly documentated, but we are limited in
time... If anybody could help with specification or give an advice, we would
really apretiate it!
Thank you.
Vadim Vohmjanin.
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