It can not scale up in throtl_adjusted_limit() if we set bps or iops is 1, which will cause IO hang when enable low limit. Thus we should treat 1 as a illegal value to avoid this issue. Signed-off-by: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx> --- block/blk-throttle.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/block/blk-throttle.c b/block/blk-throttle.c index b0d8f7c..0649bce 100644 --- a/block/blk-throttle.c +++ b/block/blk-throttle.c @@ -1687,13 +1687,13 @@ static ssize_t tg_set_limit(struct kernfs_open_file *of, goto out_finish; ret = -EINVAL; - if (!strcmp(tok, "rbps")) + if (!strcmp(tok, "rbps") && val > 1) v[0] = val; - else if (!strcmp(tok, "wbps")) + else if (!strcmp(tok, "wbps") && val > 1) v[1] = val; - else if (!strcmp(tok, "riops")) + else if (!strcmp(tok, "riops") && val > 1) v[2] = min_t(u64, val, UINT_MAX); - else if (!strcmp(tok, "wiops")) + else if (!strcmp(tok, "wiops") && val > 1) v[3] = min_t(u64, val, UINT_MAX); else if (off == LIMIT_LOW && !strcmp(tok, "idle")) idle_time = val; -- 1.8.3.1
