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-rw-r--r--block/blk-wbt.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/block/blk-wbt.h b/block/blk-wbt.h
index 8f485f8..65f1de5 100644
--- a/block/blk-wbt.h
+++ b/block/blk-wbt.h
@@ -21,6 +21,15 @@ enum {
WBT_NUM_RWQ = 2,
};
+/*
+ * Enable states. Either off, or on by default (done at init time),
+ * or on through manual setup in sysfs.
+ */
+enum {
+ WBT_STATE_ON_DEFAULT = 1,
+ WBT_STATE_ON_MANUAL = 2,
+};
+
static inline void wbt_clear_state(struct blk_issue_stat *stat)
{
stat->time &= BLK_STAT_TIME_MASK;
@@ -61,6 +70,8 @@ struct rq_wb {
int scale_step;
bool scaled_max;
+ short enable_state; /* WBT_STATE_* */
+
/*
* Number of consecutive periods where we don't have enough
* information to make a firm scale up/down decision.