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writeback: remove bdi->congested_fn

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Except for pktdvd, the only places setting congested bits are file
systems that allocate their own backing_dev_info structures.  And
pktdvd is a deprecated driver that isn't useful in stack setup
either.  So remove the dead congested_fn stacking infrastructure.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Song Liu <song@kernel.org>
Acked-by: David Sterba <dsterba@suse.com>
[axboe: fixup unused variables in bcache/request.c]
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig
2020-07-01 11:06:22 +02:00
committed by Jens Axboe
parent 8c911f3d4c
commit 21cf866145
23 changed files with 1 additions and 468 deletions
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33
drivers/md/dm.c
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@@ -1821,31 +1821,6 @@ static blk_qc_t dm_submit_bio(struct bio *bio)
return ret;
}
static int dm_any_congested(void *congested_data, int bdi_bits)
{
int r = bdi_bits;
struct mapped_device *md = congested_data;
struct dm_table *map;
if (!test_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags)) {
if (dm_request_based(md)) {
/*
* With request-based DM we only need to check the
* top-level queue for congestion.
*/
struct backing_dev_info *bdi = md->queue->backing_dev_info;
r = bdi->wb.congested & bdi_bits;
} else {
map = dm_get_live_table_fast(md);
if (map)
r = dm_table_any_congested(map, bdi_bits);
dm_put_live_table_fast(md);
}
}
return r;
}
/*-----------------------------------------------------------------
* An IDR is used to keep track of allocated minor numbers.
*---------------------------------------------------------------*/
@@ -2284,12 +2259,6 @@ 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
*/
@@ -2306,12 +2275,10 @@ 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_congested_fn(md);
break;
case DM_TYPE_NONE:
WARN_ON_ONCE(true);