path: root/block/blk-wbt.h
diff options
authorJan Kara <>2017-04-19 11:33:27 +0200
committerJens Axboe <>2017-04-19 08:49:03 -0600
commit8330cdb0fe55c9a9a8e440e56c19233229e0e259 (patch)
tree644af58ba64f8cb431d01abaff81113b4ed6a835 /block/blk-wbt.h
parentea25da48086d3bbebf3a2eeff387ea00ed96f5c4 (diff)
block: Make writeback throttling defaults consistent for SQ devices
When CFQ is used as an elevator, it disables writeback throttling because they don't play well together. Later when a different elevator is chosen for the device, writeback throttling doesn't get enabled again as it should. Make sure CFQ enables writeback throttling (if it should be enabled by default) when we switch from it to another IO scheduler. Signed-off-by: Jan Kara <> Signed-off-by: Jens Axboe <>
Diffstat (limited to 'block/blk-wbt.h')
1 files changed, 4 insertions, 0 deletions
diff --git a/block/blk-wbt.h b/block/blk-wbt.h
index ad6c78507c3a..df6de50c5d59 100644
--- a/block/blk-wbt.h
+++ b/block/blk-wbt.h
@@ -117,6 +117,7 @@ void wbt_update_limits(struct rq_wb *);
void wbt_requeue(struct rq_wb *, struct blk_issue_stat *);
void wbt_issue(struct rq_wb *, struct blk_issue_stat *);
void wbt_disable_default(struct request_queue *);
+void wbt_enable_default(struct request_queue *);
void wbt_set_queue_depth(struct rq_wb *, unsigned int);
void wbt_set_write_cache(struct rq_wb *, bool);
@@ -155,6 +156,9 @@ static inline void wbt_issue(struct rq_wb *rwb, struct blk_issue_stat *stat)
static inline void wbt_disable_default(struct request_queue *q)
+static inline void wbt_enable_default(struct request_queue *q)
static inline void wbt_set_queue_depth(struct rq_wb *rwb, unsigned int depth)