From: Sagi Grimberg <sagi@grimberg.me>

The new nvme-rdma driver will need to reinitialize all the tags as part of
the error recovery procedure (realloc the tag memory region). Add a helper
in blk-mq for it that can iterate over all requests in a tagset to make
this easier.

Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Tested-by: Ming Lin <redacted>
Reviewed-by: Stephen Bates <redacted>
Signed-off-by: Christoph Hellwig <hch@lst.de>

Looks fine.

Reviewed-by: Steve Wise <redacted>