There are use-cases like replication where need to hook the blk I/O operations for devices and perform specific operation and fallback to its original I/O operations. Prior to v5.9 there was make_request_fn and then blk_mq_submit_bio exported apis, which provided infrastructure to drivers to develop these features. However in v5.10-rc1 with below commit the API was removed from the export list. Previous commit: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?h=v5.10-rc1&id=681cc5e8667e8579a2da8fa4090c48a2d73fc3bb This patch exports the blk_mq_submit_bio symbol to provide flexibility to the drivers. Signed-off-by: Praveen Kumar <kumarpraveen@xxxxxxxxxxxxxxxxxxx> --- block/blk-mq.c | 1 + 1 file changed, 1 insertion(+) diff --git a/block/blk-mq.c b/block/blk-mq.c index 65d3a63aecc6..40a9b085f029 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -2283,6 +2283,7 @@ blk_qc_t blk_mq_submit_bio(struct bio *bio) blk_queue_exit(q); return BLK_QC_T_NONE; } +EXPORT_SYMBOL_GPL(blk_mq_submit_bio); static size_t order_to_size(unsigned int order) { -- 2.25.1
