flush request isn't queueable in some drives. Add a flag to let driver
notify block layer about this. We can optimize flush performance with the
knowledge.
Signed-off-by: Shaohua Li <shaohua.li@xxxxxxxxx>
---
include/linux/blkdev.h | 11 +++++++++++
1 file changed, 11 insertions(+)
Index: linux/include/linux/blkdev.h
===================================================================
--- linux.orig/include/linux/blkdev.h 2011-05-04 14:23:42.000000000 +0800
+++ linux/include/linux/blkdev.h 2011-05-04 14:24:40.000000000 +0800
@@ -364,6 +364,7 @@ struct request_queue
* for flush operations
*/
unsigned int flush_flags;
+ unsigned int flush_not_queueable:1;
unsigned int flush_pending_idx:1;
unsigned int flush_running_idx:1;
unsigned long flush_pending_since;
@@ -549,6 +550,16 @@ static inline void blk_clear_queue_full(
queue_flag_clear(QUEUE_FLAG_ASYNCFULL, q);
}
+static inline void blk_set_queue_flush_queueable(struct request_queue *q,
+ bool queueable)
+{
+ q->flush_not_queueable = !queueable;
+}
+
+static inline bool blk_queue_flush_queueable(struct request_queue *q)
+{
+ return !q->flush_not_queueable;
+}
/*
* mergeable request must not have _NOMERGE or _BARRIER bit set, nor may
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