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This is a version of blkdev_issue_discard which doesn't wait for the I/O to complete, but instead allows the caller to submit the final bio and/or chain it to others. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Ming Lin <ming.l@ssi.samsung.com> Signed-off-by: Sagi Grimberg <sagig@grimberg.me> Reviewed-by: Ming Lei <tom.leiming@gmail.com> Signed-off-by: Jens Axboe <axboe@fb.com>