diff options
| author | Yu Kuai <yukuai3@huawei.com> | 2023-01-17 15:08:04 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2023-01-29 15:18:34 -0700 |
| commit | 35198e32300190d52e7f50413dde4f86dea1de92 (patch) | |
| tree | 2f48cf4919ec0e254b5c0760804879bcc2da02e2 | |
| parent | 235a5a83f637e32646cd004c9b580decf1225566 (diff) | |
| download | lwn-35198e32300190d52e7f50413dde4f86dea1de92.tar.gz lwn-35198e32300190d52e7f50413dde4f86dea1de92.zip | |
blk-iocost: read params inside lock in sysfs apis
Otherwise, user might get abnormal values if params is updated
concurrently.
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20230117070806.3857142-4-yukuai1@huaweicloud.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
| -rw-r--r-- | block/blk-iocost.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/block/blk-iocost.c b/block/blk-iocost.c index 42a492096d3f..58ad4e5b2fff 100644 --- a/block/blk-iocost.c +++ b/block/blk-iocost.c @@ -3131,6 +3131,7 @@ static u64 ioc_qos_prfill(struct seq_file *sf, struct blkg_policy_data *pd, if (!dname) return 0; + spin_lock_irq(&ioc->lock); seq_printf(sf, "%s enable=%d ctrl=%s rpct=%u.%02u rlat=%u wpct=%u.%02u wlat=%u min=%u.%02u max=%u.%02u\n", dname, ioc->enabled, ioc->user_qos_params ? "user" : "auto", ioc->params.qos[QOS_RPPM] / 10000, @@ -3143,6 +3144,7 @@ static u64 ioc_qos_prfill(struct seq_file *sf, struct blkg_policy_data *pd, ioc->params.qos[QOS_MIN] % 10000 / 100, ioc->params.qos[QOS_MAX] / 10000, ioc->params.qos[QOS_MAX] % 10000 / 100); + spin_unlock_irq(&ioc->lock); return 0; } @@ -3322,12 +3324,14 @@ static u64 ioc_cost_model_prfill(struct seq_file *sf, if (!dname) return 0; + spin_lock_irq(&ioc->lock); seq_printf(sf, "%s ctrl=%s model=linear " "rbps=%llu rseqiops=%llu rrandiops=%llu " "wbps=%llu wseqiops=%llu wrandiops=%llu\n", dname, ioc->user_cost_model ? "user" : "auto", u[I_LCOEF_RBPS], u[I_LCOEF_RSEQIOPS], u[I_LCOEF_RRANDIOPS], u[I_LCOEF_WBPS], u[I_LCOEF_WSEQIOPS], u[I_LCOEF_WRANDIOPS]); + spin_unlock_irq(&ioc->lock); return 0; } |