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block: add a blk_mq_init_queue_data helper

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This allows a driver to pass a queuedata member before ->init_hctx is
called.  null_blk currently open codes this logic, but I'd rather have
it in the core to ease future maintainance.

Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2020-03-27 09:30:08 +01:00 committed by Jens Axboe
parent 348e114bbd
commit 2f227bb999
2 changed files with 11 additions and 1 deletions
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10
block/blk-mq.c
View File

@ -2724,13 +2724,15 @@ void blk_mq_release(struct request_queue *q)
blk_mq_sysfs_deinit(q);
}
struct request_queue *blk_mq_init_queue(struct blk_mq_tag_set *set)
struct request_queue *blk_mq_init_queue_data(struct blk_mq_tag_set *set,
void *queuedata)
{
struct request_queue *uninit_q, *q;
uninit_q = blk_alloc_queue_node(GFP_KERNEL, set->numa_node);
if (!uninit_q)
return ERR_PTR(-ENOMEM);
uninit_q->queuedata = queuedata;
/*
* Initialize the queue without an elevator. device_add_disk() will do
@ -2742,6 +2744,12 @@ struct request_queue *blk_mq_init_queue(struct blk_mq_tag_set *set)
return q;
}
EXPORT_SYMBOL_GPL(blk_mq_init_queue_data);
struct request_queue *blk_mq_init_queue(struct blk_mq_tag_set *set)
{
return blk_mq_init_queue_data(set, NULL);
}
EXPORT_SYMBOL(blk_mq_init_queue);
/*

2
include/linux/blk-mq.h
View File

@ -412,6 +412,8 @@ enum {
<< BLK_MQ_F_ALLOC_POLICY_START_BIT)
struct request_queue *blk_mq_init_queue(struct blk_mq_tag_set *);
struct request_queue *blk_mq_init_queue_data(struct blk_mq_tag_set *set,
void *queuedata);
struct request_queue *blk_mq_init_allocated_queue(struct blk_mq_tag_set *set,
struct request_queue *q,
bool elevator_init);