From: Christoph Hellwig hch@lst.de
mainline inclusion from mainline-v5.14-rc1 commit b461dfc49eb6fbabc60b9dad476e787ada56b7b4 category: bugfix bugzilla: 188733
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
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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 Reviewed-by: Chaitanya Kulkarni chaitanya.kulkarni@wdc.com Link: https://lore.kernel.org/r/20210602065345.355274-4-hch@lst.de Signed-off-by: Jens Axboe axboe@kernel.dk conflict: include/linux/blk-mq.h Signed-off-by: Zhong Jinghua zhongjinghua@huawei.com Signed-off-by: Li Nan linan122@huawei.com --- include/linux/blk-mq.h | 12 ++++++++++++ block/blk-mq.c | 19 +++++++++++++++++++ 2 files changed, 31 insertions(+)
diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h index 2eca0b76b3e9..74a57d8aa76d 100644 --- a/include/linux/blk-mq.h +++ b/include/linux/blk-mq.h @@ -464,6 +464,18 @@ enum {
#define BLK_MQ_NO_HCTX_IDX (-1U)
+#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); diff --git a/block/blk-mq.c b/block/blk-mq.c index 1d1200afb771..9e3934259933 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -3310,6 +3310,25 @@ 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.