bffd1ce92c
Callers expect that they only have to set the right resource owner when creating a BufFile, not during subsequent operations on it. While we could insist this be fixed at the caller level, it seems more sensible for the BufFile to take care of it. Without this, some temp files belonging to a BufFile can go away too soon, eg at the end of a subtransaction, leading to errors or crashes. Reported and fixed by Andres Freund. Back-patch to all active branches.
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