[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>

1 files changed, 6 insertions, 0 deletions

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 55ef6efe3eb5..d2dc17151f6c 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -232,7 +232,13 @@ struct request {
         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 */