[PATCH] Add one more pointer to struct request for IO scheduler usage

Then we have enough room in the request to get rid of the dynamic allocations in CFQ/AS. Signed-off-by: Jens Axboe <axboe@suse.de>

[PATCH] Add one more pointer to struct request for IO scheduler usage
Then we have enough room in the request to get rid of the dynamic allocations in CFQ/AS. Signed-off-by: Jens Axboe <axboe@suse.de>
Jens Axboe · Jens Axboe
1 parent 5380a101d3
Showing 1 changed file with 6 additions and 0 deletions Side-by-side Diff
include/linux/blkdev.h
@@ -232,7 +232,13 @@
 	struct hlist_node hash;	/* merge hash */
 	struct rb_node rb_node;	/* sort/lookup */
  
+	/*
+	 * two pointers are available for the IO schedulers, if they need
+	 * more they have to dynamically allocate it.
+	 */
 	void *elevator_private;
+	void *elevator_private2;
+
 	void *completion_data;
  
 	int rq_status;	/* should split this into a few status bits */
...	...	@@ -232,7 +232,13 @@
232	232	struct hlist_node hash; /* merge hash */
233	233	struct rb_node rb_node; /* sort/lookup */
234	234
	235	+ /*
	236	+ * two pointers are available for the IO schedulers, if they need
	237	+ * more they have to dynamically allocate it.
	238	+ */
235	239	void *elevator_private;
	240	+ void *elevator_private2;
	241	+
236	242	void *completion_data;
237	243
238	244	int rq_status; /* should split this into a few status bits */