diff options
| -rw-r--r-- | block/blk-sysfs.c | 19 | ||||
| -rw-r--r-- | block/blk-wbt.c | 3 |
2 files changed, 21 insertions, 1 deletions
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c index bb109bb0a055..3772671cf2bc 100644 --- a/block/blk-sysfs.c +++ b/block/blk-sysfs.c @@ -453,9 +453,26 @@ static ssize_t queue_wb_lat_store(struct request_queue *q, const char *page, else if (val >= 0) val *= 1000ULL; - wbt_set_min_lat(q, val); + /* + * Ensure that the queue is idled, in case the latency update + * ends up either enabling or disabling wbt completely. We can't + * have IO inflight if that happens. + */ + if (q->mq_ops) { + blk_mq_freeze_queue(q); + blk_mq_quiesce_queue(q); + } else + blk_queue_bypass_start(q); + wbt_set_min_lat(q, val); wbt_update_limits(q); + + if (q->mq_ops) { + blk_mq_unquiesce_queue(q); + blk_mq_unfreeze_queue(q); + } else + blk_queue_bypass_end(q); + return count; } diff --git a/block/blk-wbt.c b/block/blk-wbt.c index c9358f1981fb..84507d3e9a98 100644 --- a/block/blk-wbt.c +++ b/block/blk-wbt.c @@ -540,6 +540,9 @@ static enum wbt_flags bio_to_wbt_flags(struct rq_wb *rwb, struct bio *bio) { enum wbt_flags flags = 0; + if (!rwb_enabled(rwb)) + return 0; + if (bio_op(bio) == REQ_OP_READ) { flags = WBT_READ; } else if (wbt_should_throttle(rwb, bio)) { |