block, cfq: misc updates to cfq_io_context

Make the following changes to prepare for ioc/cic management cleanup.

* Add cic->q so that ioc can determine the associated queue without
  querying cfq.  This will eventually replace ->key.

* Factor out cfq_release_cic() from cic_free_func().  This function
  assumes that the caller handled locking.

* Rename __cfq_exit_single_io_context() to cfq_exit_cic() and make it
  take only @cic.

* Restructure cfq_cic_link() for future updates.

This patch doesn't introduce any functional changes.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/linux/iocontext.h b/include/linux/iocontext.h
index 28bb621ef5a2..079aea8fd8a8 100644
--- a/include/linux/iocontext.h
+++ b/include/linux/iocontext.h
@@ -15,6 +15,7 @@ struct cfq_ttime {
 
 struct cfq_io_context {
         void *key;
+        struct request_queue *q;
 
         struct cfq_queue *cfqq[2];