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Date: Fri, 28 Oct 2022 18:10:55 +0800
From: Yu Kuai <yukuai1@...weicloud.com>
To: tj@...nel.org, josef@...icpanda.com, axboe@...nel.dk,
yukuai3@...wei.com
Cc: cgroups@...r.kernel.org, linux-block@...r.kernel.org,
linux-kernel@...r.kernel.org, yukuai1@...weicloud.com,
yi.zhang@...wei.com
Subject: [PATCH -next 4/5] blk-iocost: fix sleeping in atomic context warnning in ioc_qos_write()
From: Yu Kuai <yukuai3@...wei.com>
match_u64() is called inside ioc->lock, which causes smatch static
checker warnings:
block/blk-iocost.c:3211 ioc_qos_write() warn: sleeping in atomic context
block/blk-iocost.c:3240 ioc_qos_write() warn: sleeping in atomic context
Fix the problem by prase params before holding the lock.
Fixes: 2c0647988433 ("blk-iocost: don't release 'ioc->lock' while updating params")
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Yu Kuai <yukuai3@...wei.com>
---
block/blk-iocost.c | 172 +++++++++++++++++++++++++++++----------------
1 file changed, 111 insertions(+), 61 deletions(-)
diff --git a/block/blk-iocost.c b/block/blk-iocost.c
index 2bfecc511dd9..27b41f3f1b07 100644
--- a/block/blk-iocost.c
+++ b/block/blk-iocost.c
@@ -3165,44 +3165,25 @@ static const match_table_t qos_tokens = {
{ NR_QOS_PARAMS, NULL },
};
-static ssize_t ioc_qos_write(struct kernfs_open_file *of, char *input,
- size_t nbytes, loff_t off)
-{
- struct block_device *bdev;
- struct gendisk *disk;
- struct ioc *ioc;
+struct ioc_qos_params {
u32 qos[NR_QOS_PARAMS];
- bool enable, user;
- char *p;
- int ret;
-
- bdev = blkcg_conf_open_bdev(&input);
- if (IS_ERR(bdev))
- return PTR_ERR(bdev);
-
- disk = bdev->bd_disk;
- if (!queue_is_mq(disk->queue)) {
- ret = -EPERM;
- goto out;
- }
-
- ioc = q_to_ioc(disk->queue);
- if (!ioc) {
- ret = blk_iocost_init(disk);
- if (ret)
- goto out;
- ioc = q_to_ioc(disk->queue);
- }
+ bool enable;
+ bool user;
+ bool set_qos[NR_QOS_PARAMS];
+ bool set_enable;
+ bool set_user;
+};
- blk_mq_freeze_queue(disk->queue);
- blk_mq_quiesce_queue(disk->queue);
+static struct ioc_qos_params *ioc_qos_parse_params(char *input)
+{
+ struct ioc_qos_params *params;
+ char *p;
+ int ret = -EINVAL;
- spin_lock_irq(&ioc->lock);
- memcpy(qos, ioc->params.qos, sizeof(qos));
- enable = ioc->enabled;
- user = ioc->user_qos_params;
+ params = kzalloc(sizeof(*params), GFP_KERNEL);
+ if (!params)
+ return ERR_PTR(-ENOMEM);
- ret = -EINVAL;
while ((p = strsep(&input, " \t\n"))) {
substring_t args[MAX_OPT_ARGS];
char buf[32];
@@ -3218,19 +3199,21 @@ static ssize_t ioc_qos_write(struct kernfs_open_file *of, char *input,
err = match_u64(&args[0], &v);
if (err) {
ret = err;
- goto out_unlock;
+ goto out_err;
}
- enable = v;
+ params->enable = v;
+ params->set_enable = true;
continue;
case QOS_CTRL:
match_strlcpy(buf, &args[0], sizeof(buf));
if (!strcmp(buf, "auto"))
- user = false;
+ params->user = false;
else if (!strcmp(buf, "user"))
- user = true;
+ params->user = true;
else
- goto out_unlock;
+ goto out_err;
+ params->set_user = true;
continue;
}
@@ -3240,62 +3223,128 @@ 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 out_unlock;
+ goto out_err;
if (cgroup_parse_float(buf, 2, &v))
- goto out_unlock;
+ goto out_err;
if (v < 0 || v > 10000)
- goto out_unlock;
- qos[tok] = v * 100;
+ goto out_err;
+ params->qos[tok] = v * 100;
break;
case QOS_RLAT:
case QOS_WLAT:
err = match_u64(&args[0], &v);
if (err) {
ret = err;
- goto out_unlock;
+ goto out_err;
}
- qos[tok] = v;
+ params->qos[tok] = v;
break;
case QOS_MIN:
case QOS_MAX:
if (match_strlcpy(buf, &args[0], sizeof(buf)) >=
sizeof(buf))
- goto out_unlock;
+ goto out_err;
if (cgroup_parse_float(buf, 2, &v))
- goto out_unlock;
+ goto out_err;
if (v < 0)
- goto out_unlock;
- qos[tok] = clamp_t(s64, v * 100,
+ goto out_err;
+ params->qos[tok] = clamp_t(s64, v * 100,
VRATE_MIN_PPM, VRATE_MAX_PPM);
break;
default:
- goto out_unlock;
+ goto out_err;
}
- user = true;
+ params->user = true;
+ params->set_user = true;
+ params->set_qos[tok] = true;
}
- if (qos[QOS_MIN] > qos[QOS_MAX])
- goto out_unlock;
+ return params;
+
+out_err:
+ kfree(params);
+ return ERR_PTR(ret);
+}
+
+static int ioc_qos_update_params(struct request_queue *q, struct ioc *ioc,
+ struct ioc_qos_params *params)
+{
+ int i;
- if (enable) {
- blk_stat_enable_accounting(disk->queue);
- blk_queue_flag_set(QUEUE_FLAG_RQ_ALLOC_TIME, disk->queue);
+ for (i = 0; i < NR_QOS_PARAMS; ++i)
+ if (!params->set_qos[i])
+ params->qos[i] = ioc->params.qos[i];
+ if (params->qos[QOS_MIN] > params->qos[QOS_MAX])
+ return -EINVAL;
+
+ if (!params->set_enable)
+ params->enable = ioc->enabled;
+ if (params->enable) {
+ blk_stat_enable_accounting(q);
+ blk_queue_flag_set(QUEUE_FLAG_RQ_ALLOC_TIME, q);
ioc->enabled = true;
- wbt_disable_default(disk->queue);
+ wbt_disable_default(q);
} else {
- blk_queue_flag_clear(QUEUE_FLAG_RQ_ALLOC_TIME, disk->queue);
+ blk_queue_flag_clear(QUEUE_FLAG_RQ_ALLOC_TIME, q);
ioc->enabled = false;
- wbt_enable_default(disk->queue);
+ wbt_enable_default(q);
}
- if (user) {
- memcpy(ioc->params.qos, qos, sizeof(qos));
+ if (!params->set_user)
+ params->user = ioc->user_qos_params;
+ if (params->user) {
+ memcpy(ioc->params.qos, params->qos, sizeof(params->qos));
ioc->user_qos_params = true;
} else {
ioc->user_qos_params = false;
}
+ return 0;
+}
+
+static ssize_t ioc_qos_write(struct kernfs_open_file *of, char *input,
+ size_t nbytes, loff_t off)
+{
+ struct block_device *bdev;
+ struct gendisk *disk;
+ struct ioc *ioc;
+ struct ioc_qos_params *params;
+ int ret;
+
+ bdev = blkcg_conf_open_bdev(&input);
+ if (IS_ERR(bdev))
+ return PTR_ERR(bdev);
+
+ disk = bdev->bd_disk;
+ if (!queue_is_mq(disk->queue)) {
+ ret = -EPERM;
+ goto out;
+ }
+
+ ioc = q_to_ioc(disk->queue);
+ if (!ioc) {
+ ret = blk_iocost_init(disk);
+ if (ret)
+ goto out;
+ ioc = q_to_ioc(disk->queue);
+ }
+
+ params = ioc_qos_parse_params(input);
+ if (IS_ERR(params)) {
+ ret = PTR_ERR(params);
+ goto out;
+ }
+
+ blk_mq_freeze_queue(disk->queue);
+ blk_mq_quiesce_queue(disk->queue);
+
+ spin_lock_irq(&ioc->lock);
+
+ ret = ioc_qos_update_params(disk->queue, ioc, params);
+ if (ret)
+ goto out_unlock;
+
ioc_refresh_params(ioc, true);
ret = nbytes;
@@ -3303,6 +3352,7 @@ static ssize_t ioc_qos_write(struct kernfs_open_file *of, char *input,
spin_unlock_irq(&ioc->lock);
blk_mq_unquiesce_queue(disk->queue);
blk_mq_unfreeze_queue(disk->queue);
+ kfree(params);
out:
blkdev_put_no_open(bdev);
--
2.31.1
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