Fix minor bug in XLogFileRead() that accidentally worked.
Cascading replication copied the incoming file into pg_xlog but didn't set path correctly, so the first attempt to open file failed causing it to loop around and look for file in pg_xlog. So the earlier coding worked, but accidentally rather than by design. Spotted by Fujii Masao, fix by Fujii Masao and Simon Riggs
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@ -2805,6 +2805,11 @@ XLogFileRead(XLogSegNo segno, int emode, TimeLineID tli,
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errmsg("could not rename file \"%s\" to \"%s\": %m",
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path, xlogfpath)));
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/*
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* Set path to point at the new file in pg_xlog.
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*/
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strncpy(path, xlogfpath, MAXPGPATH);
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/*
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* If the existing segment was replaced, since walsenders might have
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* it open, request them to reload a currently-open segment.
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