[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>

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 55ef6efe3eb54b994b0fcb47543d1588b7463037..d2dc17151f6c5741fbc714d215e8c4d9e2922627 100644 (file)
--- 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 */