Ensure that creation of an empty relfile is fsync'd at checkpoint.#1557
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whitehawk wants to merge 1 commit intoadb-6.x-devfrom
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Ensure that creation of an empty relfile is fsync'd at checkpoint.#1557whitehawk wants to merge 1 commit intoadb-6.x-devfrom
whitehawk wants to merge 1 commit intoadb-6.x-devfrom
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If you create a table and don't insert any data into it, the relation file is never fsync'd. You don't lose data, because an empty table doesn't have any data to begin with, but if you crash and lose the file, subsequent operations on the table will fail with "could not open file" error. To fix, register an fsync request in mdcreate(), like we do for mdwrite(). Per discussion, we probably should also fsync the containing directory after creating a new file. But that's a separate and much wider issue. Backpatch to all supported versions. Reviewed-by: Andres Freund, Thomas Munro Discussion: https://www.postgresql.org/message-id/d47d8122-415e-425c-d0a2-e0160829702d%40iki.fi (cherry picked from commit 1b4f1c6) Changes comparing to the original commit: 1. 'mdfd' variable is not presented in 'mdcreate()' in this version, so use a proper alternative instead of it.
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Do not squash.