> > the wait-on-buffer is not strictly necessary: it's probably there to make
>
> maybe not but I need to check some more bit to be sure.
Same scenario, but with read-in-progress started before we do getblk(). BTW,
old writeback is harmless - we will overwrite anyway. And _that_ can happen
without direct access to device - truncate() doesn't terminate writeout of
the indirect blocks it frees (IMO it should, but that's another story).
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