Commit fa224eed authored by Jens Axboe's avatar Jens Axboe

blk-wbt: cleanup disable-by-default for CFQ

Make it clear that we are disabling wbt for the specified queued,
if it was enabled by default. This is in preparation for allowing
users to re-enable wbt, and not have it disabled automatically
Signed-off-by: default avatarJens Axboe <>
parent 80e091d1
......@@ -665,15 +665,21 @@ void wbt_set_write_cache(struct rq_wb *rwb, bool write_cache_on)
rwb->wc = write_cache_on;
void wbt_disable(struct rq_wb *rwb)
* Disable wbt, if enabled by default. Only called from CFQ, if we have
* cgroups enabled
void wbt_disable_default(struct request_queue *q)
struct rq_wb *rwb = q->rq_wb;
if (rwb) {
rwb->win_nsec = rwb->min_lat_nsec = 0;
u64 wbt_default_latency_nsec(struct request_queue *q)
......@@ -105,7 +105,7 @@ void wbt_exit(struct request_queue *);
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(struct rq_wb *);
void wbt_disable_default(struct request_queue *);
void wbt_set_queue_depth(struct rq_wb *, unsigned int);
void wbt_set_write_cache(struct rq_wb *, bool);
......@@ -141,7 +141,7 @@ static inline void wbt_requeue(struct rq_wb *rwb, struct blk_issue_stat *stat)
static inline void wbt_issue(struct rq_wb *rwb, struct blk_issue_stat *stat)
static inline void wbt_disable(struct rq_wb *rwb)
static inline void wbt_disable_default(struct request_queue *q)
static inline void wbt_set_queue_depth(struct rq_wb *rwb, unsigned int depth)
......@@ -3780,13 +3780,10 @@ static void check_blkcg_changed(struct cfq_io_cq *cic, struct bio *bio)
* If we have a non-root cgroup, we can depend on that to
* do proper throttling of writes. Turn off wbt for that
* case.
* case, if it was enabled by default.
if (nonroot_cg) {
struct request_queue *q = cfqd->queue;
if (nonroot_cg)
* Drop reference to queues. New queues will be assigned in new
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