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The code dealing with bdi_work->state and completion of a bdi_work is a
major mess currently. This patch makes sure we directly use one set of
flags to deal with it, and use it consistently, which means:
- always notify about completion from the rcu callback. We only ever
wait for it from on-stack callers, so this simplification does not
even cause a theoretical slowdown currently. It also makes sure we
don't miss out on the notification if we ever add other callers to
wait for it.
- make earlier completion notification depending on the on-stack
allocation, not the sync mode. If we introduce new callers that
want to do WB_SYNC_NONE writeback from on-stack callers this will
be nessecary.
Also rename bdi_wait_on_work_clear to bdi_wait_on_work_done and inline
a few small functions into their only caller to make the code
understandable.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
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