rbd: don't assign extent info in rbd_do_request()
In rbd_do_request() there's a sort of last-minute assignment of the extent offset and length and payload length for read and write operations. Move those assignments into the caller (in those spots that might initiate read or write operations) Signed-off-by: NAlex Elder <elder@inktank.com> Reviewed-by: NJosh Durgin <josh.durgin@inktank.com>
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