On 10/13/2010 09:07 AM, Stefan Hajnoczi wrote:
That means we can maintain the physical size without introducing
additional fsync()s in the allocation path. Since we're already
writing out the header anyway, the write operation is basically
free too.
I don't see how it is free. It's an extra write. The good news is
that it's very easy to amortize.
We only need to update the header field on disk when we're already
updating the header, so it's not even an extra write operation.
Because we're already writing out the sector that contains that field in
the header.
Regards,
Anthony Liguori
Stefan
