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642107d5ba
not being consulted anywhere, so remove it and remove the _mdnblocks() calls that were used to set it. Change smgrextend interface to pass in the target block number (ie, current file length) --- the caller always knows this already, having already done smgrnblocks(), so it's silly to do it over again inside mdextend. Net result: extension of a file now takes one lseek(SEEK_END) and a write(), not three lseeks and a write.