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block-backend: align max_transfer to request alignment
Block device requests must be aligned to bs->bl.request_alignment. It makes sense for drivers to align bs->bl.max_transfer the same way; however when there is no specified limit, blk_get_max_transfer just returns INT_MAX. Since the contract of the function does not specify that INT_MAX means "no maximum", just align the outcome of the function (whether INT_MAX or bs->bl.max_transfer) before returning it. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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