If io accounting is disabled, there is no point to handle such device
in diskstats_show(), and it can be confused for users because all fields
in iostat are zero while the disk is handling io.
Signed-off-by: Yu Kuai <yukuai3@xxxxxxxxxx>
---
block/genhd.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/block/genhd.c b/block/genhd.c
index c3b32c665aec..e5307f512185 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -937,6 +937,9 @@ ssize_t part_stat_show(struct device *dev,
struct disk_stats stat;
unsigned int inflight;
+ if (!blk_queue_io_stat(q))
+ return sprintf(buf, "io accounting is disabled\n");
+
if (queue_is_mq(q))
inflight = blk_mq_in_flight(q, bdev);
else
@@ -1207,6 +1210,8 @@ static int diskstats_show(struct seq_file *seqf, void *v)
xa_for_each(&gp->part_tbl, idx, hd) {
if (bdev_is_partition(hd) && !bdev_nr_sectors(hd))
continue;
+ if (!blk_queue_io_stat(gp->queue))
+ continue;
if (queue_is_mq(gp->queue))
inflight = blk_mq_in_flight(gp->queue, hd);
else
--
2.31.1
