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dm: fix congested_fn for request-based device 

We neither assign congested_fn for requested-based blk-mq device nor
implement it correctly. So fix both.

Also, remove incorrect comment from dm_init_normal_md_queue and rename
it to dm_init_congested_fn.

Fixes: 4aa9c692e0 ("bdi: separate out congested state into a separate struct")
Cc: stable@vger.kernel.org
Signed-off-by: Hou Tao <houtao1@huawei.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Hou Tao 2020-03-03 16:45:01 +08:00 committed by Mike Snitzer
parent 248aa2645a
commit 974f51e863
1 changed files with 10 additions and 11 deletions
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21
drivers/md/dm.c
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@ -1788,7 +1788,8 @@ static int dm_any_congested(void *congested_data, int bdi_bits)
* With request-based DM we only need to check the
* top-level queue for congestion.
*/
r = md->queue->backing_dev_info->wb.state & bdi_bits;
struct backing_dev_info *bdi = md->queue->backing_dev_info;
r = bdi->wb.congested->state & bdi_bits;
} else {
map = dm_get_live_table_fast(md);
if (map)
@ -1854,15 +1855,6 @@ static const struct dax_operations dm_dax_ops;
static void dm_wq_work(struct work_struct *work);
static void dm_init_normal_md_queue(struct mapped_device *md)
{
/*
* Initialize aspects of queue that aren't relevant for blk-mq
*/
md->queue->backing_dev_info->congested_data = md;
md->queue->backing_dev_info->congested_fn = dm_any_congested;
}
static void cleanup_mapped_device(struct mapped_device *md)
{
if (md->wq)
@ -2249,6 +2241,12 @@ struct queue_limits *dm_get_queue_limits(struct mapped_device *md)
}
EXPORT_SYMBOL_GPL(dm_get_queue_limits);
static void dm_init_congested_fn(struct mapped_device *md)
{
md->queue->backing_dev_info->congested_data = md;
md->queue->backing_dev_info->congested_fn = dm_any_congested;
}
/*
* Setup the DM device's queue based on md's type
*/
@ -2265,11 +2263,12 @@ int dm_setup_md_queue(struct mapped_device *md, struct dm_table *t)
DMERR("Cannot initialize queue for request-based dm-mq mapped device");
return r;
}
dm_init_congested_fn(md);
break;
case DM_TYPE_BIO_BASED:
case DM_TYPE_DAX_BIO_BASED:
case DM_TYPE_NVME_BIO_BASED:
dm_init_normal_md_queue(md);
dm_init_congested_fn(md);
break;
case DM_TYPE_NONE:
WARN_ON_ONCE(true);