diff options
| author | Yu Kuai <yukuai3@huawei.com> | 2022-10-19 20:15:16 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2022-10-23 18:59:17 -0600 |
| commit | 3642ef4d95699193c4a461862382e643ae3720f0 (patch) | |
| tree | e0a696d7266ff27dadb46349b6bde22da71ea6e1 /block/blk-sysfs.c | |
| parent | a9a236d238a5e8ab2e74ca62c2c7ba5dd435af77 (diff) | |
| download | linux-3642ef4d95699193c4a461862382e643ae3720f0.tar.gz linux-3642ef4d95699193c4a461862382e643ae3720f0.tar.bz2 linux-3642ef4d95699193c4a461862382e643ae3720f0.zip | |
blk-wbt: don't show valid wbt_lat_usec in sysfs while wbt is disabled
Currently, if wbt is initialized and then disabled by
wbt_disable_default(), sysfs will still show valid wbt_lat_usec, which
will confuse users that wbt is still enabled.
This patch shows wbt_lat_usec as zero if it's disabled.
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Reported-and-tested-by: Holger Hoffstätte <holger@applied-asynchrony.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20221019121518.3865235-5-yukuai1@huaweicloud.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-sysfs.c')
| -rw-r--r-- | block/blk-sysfs.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c index e71b3b43927c..7b98c7074771 100644 --- a/block/blk-sysfs.c +++ b/block/blk-sysfs.c @@ -470,6 +470,9 @@ static ssize_t queue_wb_lat_show(struct request_queue *q, char *page) if (!wbt_rq_qos(q)) return -EINVAL; + if (wbt_disabled(q)) + return sprintf(page, "0\n"); + return sprintf(page, "%llu\n", div_u64(wbt_get_min_lat(q), 1000)); } |