blk-mq: use bd->last == true for list inserts
If we are issuing a list of requests, we know if we're at the last one. If we fail issuing, ensure that we call ->commits_rqs() to flush any potential previous requests. Reviewed-by: Omar Sandoval <osandov@fb.com> Reviewed-by: Ming Lei <ming.lei@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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