set readahead buffer size from roundup(user_size) + 4k to roundup(use…
Summary: Users usually set readahead buffer to a multiple of 4k, more than that, usually a multiple of blocks. So previously we set real buffer size 512 * n + 4k, which may introduce an additional block reading. Closes https://github.com/facebook/rocksdb/pull/2138 Differential Revision: D4871504 Pulled By: lightmark fbshipit-source-id: b070faa51d92e976e8e8468c00692699e585e243
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