On Mon, Aug 31 2009, Theodore Tso wrote:

At the risk of asking a stupid question, what *is* range_cyclic and
what is it trying to do?  I've been looking at the code and am I'm
getting myself very confused about what the code is trying to do and
what was its original intent.

Range cyclic means that the current writeback in ->writepages() should
start where it left off the last time, non-range cyclic starts off at
->range_start. ->writepages() can use mapping->writeback_index to store
such information.

-- 
Jens Axboe

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