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... instead of using a multi-variable state machine. The net effect of this code is exactly the same as the previous implementation, except: - the operation after Write() returns an error might differ - If the file ends with zeroes, we don't Seek(-1), and we don't create a hole at all if it is too small, preferring to save a syscall. But this formulation is hopefully easier to prove correct. Signed-off-by: Miloslav Trmač <mitr@redhat.com>