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Simon Riggs authored
We copy the buffer before inserting an XLOG_HINT to avoid WAL CRC errors caused by concurrent hint writes to buffer while share locked. To make this work we refactor RestoreBackupBlock() to allow an XLOG_HINT to avoid the normal path for backup blocks, which assumes the underlying buffer is exclusive locked. Resulting code completely changes layout of XLOG_HINT WAL records, but this isn't even beta code, so this is a low impact change. In passing, avoid taking WALInsertLock for full page writes on checksummed hints, remove related cruft from XLogInsert() and improve xlog_desc record for XLOG_HINT. Andres Freund Bug report by Fujii Masao, testing by Jeff Janes and Jaime Casanova, review by Jeff Davis and Simon Riggs. Applied with changes from review and some comment editing.
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