[PATCH 03/30] blk-mq: add the blk_mq_alloc_disk APIs
From: Christoph Hellwig <hch@lst.de>
Date: 2021-06-02 06:54:34
Also in:
ceph-devel, dm-devel, linux-block, linux-mmc, linuxppc-dev, virtualization, xen-devel
Subsystem:
block layer, the rest · Maintainers:
Jens Axboe, Linus Torvalds
Add a new API to allocate a gendisk including the request_queue for use with blk-mq based drivers. This is to avoid boilerplate code in drivers. Signed-off-by: Christoph Hellwig <hch@lst.de> --- block/blk-mq.c | 19 +++++++++++++++++++ include/linux/blk-mq.h | 12 ++++++++++++ 2 files changed, 31 insertions(+)
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 6112741e1ff9..1e6036e6fd66 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c@@ -3137,6 +3137,25 @@ struct request_queue *blk_mq_init_queue(struct blk_mq_tag_set *set) } EXPORT_SYMBOL(blk_mq_init_queue); +struct gendisk *__blk_mq_alloc_disk(struct blk_mq_tag_set *set, void *queuedata) +{ + struct request_queue *q; + struct gendisk *disk; + + q = blk_mq_init_queue_data(set, queuedata); + if (IS_ERR(q)) + return ERR_CAST(q); + + disk = __alloc_disk_node(0, set->numa_node); + if (!disk) { + blk_cleanup_queue(q); + return ERR_PTR(-ENOMEM); + } + disk->queue = q; + return disk; +} +EXPORT_SYMBOL(__blk_mq_alloc_disk); + /* * Helper for setting up a queue with mq ops, given queue depth, and * the passed in mq ops flags.
diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index 73750b2838d2..f496c6c5b5d2 100644
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h@@ -426,6 +426,18 @@ enum { ((policy & ((1 << BLK_MQ_F_ALLOC_POLICY_BITS) - 1)) \ << BLK_MQ_F_ALLOC_POLICY_START_BIT) +#define blk_mq_alloc_disk(set, queuedata) \ +({ \ + static struct lock_class_key __key; \ + struct gendisk *__disk = __blk_mq_alloc_disk(set, queuedata); \ + \ + if (__disk) \ + lockdep_init_map(&__disk->lockdep_map, \ + "(bio completion)", &__key, 0); \ + __disk; \ +}) +struct gendisk *__blk_mq_alloc_disk(struct blk_mq_tag_set *set, + void *queuedata); 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);
--
2.30.2