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block: RCU free request_queue

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RCU free request_queue so that blkcg_gq->q can be dereferenced under
RCU lock.  This will be used to implement hierarchical stats.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
This commit is contained in:
Tejun Heo
2013-01-09 08:05:13 -08:00
parent 16b3de6652
commit 548bc8e1b3
2 changed files with 10 additions and 1 deletions
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2
include/linux/blkdev.h
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@@ -19,6 +19,7 @@
#include <linux/gfp.h>
#include <linux/bsg.h>
#include <linux/smp.h>
#include <linux/rcupdate.h>
#include <asm/scatterlist.h>
@@ -437,6 +438,7 @@ struct request_queue {
/* Throttle data */
struct throtl_data *td;
#endif
struct rcu_head rcu_head;
};
#define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */