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blk-mq: factor out a blk_mq_alloc_sq_tag_set helper

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Factour out a helper to initialize a simple single hw queue tag_set from
blk_mq_init_sq_queue.  This will allow to phase out blk_mq_init_sq_queue
in favor of a more symmetric and general API.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Link: https://lore.kernel.org/r/20210602065345.355274-2-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2021-06-02 09:53:16 +03:00 committed by Jens Axboe
parent a624eb5203
commit cdb14e0f77
2 changed files with 21 additions and 14 deletions
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32
block/blk-mq.c
View File

@ -3152,24 +3152,12 @@ struct request_queue *blk_mq_init_sq_queue(struct blk_mq_tag_set *set,
struct request_queue *q;
int ret;
memset(set, 0, sizeof(*set));
set->ops = ops;
set->nr_hw_queues = 1;
set->nr_maps = 1;
set->queue_depth = queue_depth;
set->numa_node = NUMA_NO_NODE;
set->flags = set_flags;
ret = blk_mq_alloc_tag_set(set);
ret = blk_mq_alloc_sq_tag_set(set, ops, queue_depth, set_flags);
if (ret)
return ERR_PTR(ret);
q = blk_mq_init_queue(set);
if (IS_ERR(q)) {
if (IS_ERR(q))
blk_mq_free_tag_set(set);
return q;
}
return q;
}
EXPORT_SYMBOL(blk_mq_init_sq_queue);
@ -3589,6 +3577,22 @@ out_free_mq_map:
}
EXPORT_SYMBOL(blk_mq_alloc_tag_set);
/* allocate and initialize a tagset for a simple single-queue device */
int blk_mq_alloc_sq_tag_set(struct blk_mq_tag_set *set,
const struct blk_mq_ops *ops, unsigned int queue_depth,
unsigned int set_flags)
{
memset(set, 0, sizeof(*set));
set->ops = ops;
set->nr_hw_queues = 1;
set->nr_maps = 1;
set->queue_depth = queue_depth;
set->numa_node = NUMA_NO_NODE;
set->flags = set_flags;
return blk_mq_alloc_tag_set(set);
}
EXPORT_SYMBOL_GPL(blk_mq_alloc_sq_tag_set);
void blk_mq_free_tag_set(struct blk_mq_tag_set *set)
{
int i, j;

3
include/linux/blk-mq.h
View File

@ -439,6 +439,9 @@ struct request_queue *blk_mq_init_sq_queue(struct blk_mq_tag_set *set,
void blk_mq_unregister_dev(struct device *, struct request_queue *);
int blk_mq_alloc_tag_set(struct blk_mq_tag_set *set);
int blk_mq_alloc_sq_tag_set(struct blk_mq_tag_set *set,
const struct blk_mq_ops *ops, unsigned int queue_depth,
unsigned int set_flags);
void blk_mq_free_tag_set(struct blk_mq_tag_set *set);
void blk_mq_flush_plug_list(struct blk_plug *plug, bool from_schedule);