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-rw-r--r--block/blk-throttle.c20
1 files changed, 18 insertions, 2 deletions
diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index b7b69ecb6e967..1fade5078fc16 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -212,12 +212,28 @@ static struct throtl_data *sq_to_td(struct throtl_service_queue *sq)
static uint64_t tg_bps_limit(struct throtl_grp *tg, int rw)
{
- return tg->bps[rw][tg->td->limit_index];
+ struct blkcg_gq *blkg = tg_to_blkg(tg);
+ uint64_t ret;
+
+ if (cgroup_subsys_on_dfl(io_cgrp_subsys) && !blkg->parent)
+ return U64_MAX;
+ ret = tg->bps[rw][tg->td->limit_index];
+ if (ret == 0 && tg->td->limit_index == LIMIT_LOW)
+ return tg->bps[rw][LIMIT_MAX];
+ return ret;
}
static unsigned int tg_iops_limit(struct throtl_grp *tg, int rw)
{
- return tg->iops[rw][tg->td->limit_index];
+ struct blkcg_gq *blkg = tg_to_blkg(tg);
+ unsigned int ret;
+
+ if (cgroup_subsys_on_dfl(io_cgrp_subsys) && !blkg->parent)
+ return UINT_MAX;
+ ret = tg->iops[rw][tg->td->limit_index];
+ if (ret == 0 && tg->td->limit_index == LIMIT_LOW)
+ return tg->iops[rw][LIMIT_MAX];
+ return ret;
}
/**