block: bounce: avoid direct access to bvec table
We will support multipage bvecs in the future, so change to iterator way for getting bv_page of bvec from original bio. Cc: Matthew Wilcox <willy@infradead.org> Signed-off-by: NMing Lei <ming.lei@redhat.com> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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