[PATCH -next v2 1/9] blk-iocost: cleanup ioc_qos_write() and ioc_cost_model_write()

Li Nan
2022-11-30T13:00:59Z

From: Yu Kuai <yukuai3@huawei.com>

There are no functional changes, just to make the code a litter cleaner
and follow up patches easier.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Li Nan <linan122@huawei.com>
---
block/blk-iocost.c | 62 +++++++++++++++++++---------------------------
1 file changed, 25 insertions(+), 37 deletions(-)

diff --git a/block/blk-iocost.c b/block/blk-iocost.c
index f01359906c83..fd495e823db2 100644
--- a/block/blk-iocost.c
+++ b/block/blk-iocost.c
@@ -3185,7 +3185,7 @@ static ssize_t ioc_qos_write(struct kernfs_open_file *of, char *input,
if (!ioc) {
ret = blk_iocost_init(disk);
if (ret)
- goto err;
+ goto out;
ioc = q_to_ioc(disk->queue);
}

@@ -3197,6 +3197,7 @@ static ssize_t ioc_qos_write(struct kernfs_open_file *of, char *input,
enable = ioc->enabled;
user = ioc->user_qos_params;

+ ret = -EINVAL;
while ((p = strsep(&input, " \t\n"))) {
substring_t args[MAX_OPT_ARGS];
char buf[32];
@@ -3218,7 +3219,7 @@ static ssize_t ioc_qos_write(struct kernfs_open_file *of, char *input,
else if (!strcmp(buf, "user"))
user = true;
else
- goto einval;
+ goto out_unlock;
continue;
}

@@ -3228,39 +3229,39 @@ static ssize_t ioc_qos_write(struct kernfs_open_file *of, char *input,
case QOS_WPPM:
if (match_strlcpy(buf, &args[0], sizeof(buf)) >=
sizeof(buf))
- goto einval;
+ goto out_unlock;
if (cgroup_parse_float(buf, 2, &v))
- goto einval;
+ goto out_unlock;
if (v < 0 || v > 10000)
- goto einval;
+ goto out_unlock;
qos[tok] = v * 100;
break;
case QOS_RLAT:
case QOS_WLAT:
if (match_u64(&args[0], &v))
- goto einval;
+ goto out_unlock;
qos[tok] = v;
break;
case QOS_MIN:
case QOS_MAX:
if (match_strlcpy(buf, &args[0], sizeof(buf)) >=
sizeof(buf))
- goto einval;
+ goto out_unlock;
if (cgroup_parse_float(buf, 2, &v))
- goto einval;
+ goto out_unlock;
if (v < 0)
- goto einval;
+ goto out_unlock;
qos[tok] = clamp_t(s64, v * 100,
VRATE_MIN_PPM, VRATE_MAX_PPM);
break;
default:
- goto einval;
+ goto out_unlock;
}
user = true;
}

if (qos[QOS_MIN] > qos[QOS_MAX])
- goto einval;
+ goto out_unlock;

if (enable) {
blk_stat_enable_accounting(disk->queue);
@@ -3281,21 +3282,14 @@ static ssize_t ioc_qos_write(struct kernfs_open_file *of, char *input,
}

ioc_refresh_params(ioc, true);
- spin_unlock_irq(&ioc->lock);
+ ret = nbytes;

- blk_mq_unquiesce_queue(disk->queue);
- blk_mq_unfreeze_queue(disk->queue);
-
- blkdev_put_no_open(bdev);
- return nbytes;
-einval:
+out_unlock:
spin_unlock_irq(&ioc->lock);
-
blk_mq_unquiesce_queue(disk->queue);
blk_mq_unfreeze_queue(disk->queue);

- ret = -EINVAL;
-err:
+out:
blkdev_put_no_open(bdev);
return ret;
}
@@ -3364,7 +3358,7 @@ static ssize_t ioc_cost_model_write(struct kernfs_open_file *of, char *input,
if (!ioc) {
ret = blk_iocost_init(bdev->bd_disk);
if (ret)
- goto err;
+ goto out;
ioc = q_to_ioc(q);
}

@@ -3375,6 +3369,7 @@ static ssize_t ioc_cost_model_write(struct kernfs_open_file *of, char *input,
memcpy(u, ioc->params.i_lcoefs, sizeof(u));
user = ioc->user_cost_model;

+ ret = -EINVAL;
while ((p = strsep(&input, " \t\n"))) {
substring_t args[MAX_OPT_ARGS];
char buf[32];
@@ -3392,20 +3387,20 @@ static ssize_t ioc_cost_model_write(struct kernfs_open_file *of, char *input,
else if (!strcmp(buf, "user"))
user = true;
else
- goto einval;
+ goto out_unlock;
continue;
case COST_MODEL:
match_strlcpy(buf, &args[0], sizeof(buf));
if (strcmp(buf, "linear"))
- goto einval;
+ goto out_unlock;
continue;
}

tok = match_token(p, i_lcoef_tokens, args);
if (tok == NR_I_LCOEFS)
- goto einval;
+ goto out_unlock;
if (match_u64(&args[0], &v))
- goto einval;
+ goto out_unlock;
u[tok] = v;
user = true;
}
@@ -3416,23 +3411,16 @@ static ssize_t ioc_cost_model_write(struct kernfs_open_file *of, char *input,
} else {
ioc->user_cost_model = false;
}
- ioc_refresh_params(ioc, true);
- spin_unlock_irq(&ioc->lock);

- blk_mq_unquiesce_queue(q);
- blk_mq_unfreeze_queue(q);
-
- blkdev_put_no_open(bdev);
- return nbytes;
+ ioc_refresh_params(ioc, true);
+ ret = nbytes;

-einval:
+out_unlock:
spin_unlock_irq(&ioc->lock);
-
blk_mq_unquiesce_queue(q);
blk_mq_unfreeze_queue(q);

- ret = -EINVAL;
-err:
+out:
blkdev_put_no_open(bdev);
return ret;
}
--
2.31.1