Maysam Yabandeh 349542332a Fix race condition on options_file_number_ (#4780)
Summary:
options_file_number_ must be written under db::mutex_ sine its read is protected by mutex_ in ::GetLiveFiles(). However currently it is written in ::RenameTempFileToOptionsFile() which according to its contract must be called without holding db::mutex_. The patch fixes the race condition by also acquitting the mutex_ before writing options_file_number_. Also it does that only if the rename of option file is successful.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4780

Differential Revision: D13461411

Pulled By: maysamyabandeh

fbshipit-source-id: 2d5bae96a1f3e969ef2505b737cf2d7ae749787b
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