On 23 Oct 2017, at 16.51, Christoph Hellwig [off-list ref] wrote:

This helper allows reinserting a bio into a new queue without much
overhead, but requires all queue limits to be the same for the upper
and lower queues, and it does not provide any recursion preventions.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
---
block/blk-core.c       | 34 ++++++++++++++++++++++++++++++++++
include/linux/blkdev.h |  1 +
2 files changed, 35 insertions(+)

Reviewed-by: Javier González <redacted>