writeback: add wb_writeback_work->auto_free
Currently, a wb_writeback_work is freed automatically on completion if
it doesn't have ->done set. Add wb_writeback_work->auto_free to make
the switch explicit. This will help cgroup writeback support where
waiting for completion and whether to free automatically don't
necessarily move together.
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@fb.com>
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