core: simplify background IO API

- removes unused "completed" IO callback handler
- moves primary post-IO callback handlers from the queue definition to
  the actual IO objects.
- allows IO object callbacks to be handled generically instead of based
  on the queue they were submitted from.

1 files changed, 1 insertions, 3 deletions

diff --git a/storage.h b/storage.h
index 55c5e1f..a0fc1a8 100644
--- a/storage.h
+++ b/storage.h
@@ -17,10 +17,8 @@ void process_extstore_stats(ADD_STAT add_stats, conn *c);
 bool storage_validate_item(void *e, item *it);
 int storage_get_item(conn *c, item *it, mc_resp *resp);
 
-// callbacks for the IO queue subsystem.
+// callback for the IO queue subsystem.
 void storage_submit_cb(io_queue_t *q);
-void storage_complete_cb(io_queue_t *q);
-void storage_finalize_cb(io_pending_t *pending);
 
 // Thread functions.
 int start_storage_write_thread(void *arg);