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d8cd0c6c95
Instead of relying on the ability to atomically overwrite the entire relmap file in one shot, write a new one and durably rename it into place. Removing the struct padding and the calculation showing why the map is exactly 512 bytes, and change the maximum number of entries to a nearby round number. Patch by me, reviewed by Andres Freund and Dilip Kumar. Discussion: http://postgr.es/m/CA+TgmoZq5%3DLWDK7kHaUbmWXxcaTuw_QwafgG9dr-BaPym_U8WQ%40mail.gmail.com Discussion: http://postgr.es/m/CAFiTN-ttOXLX75k_WzRo9ar=VvxFhrHi+rJxns997F+yvkm==A@mail.gmail.com