On Mon, Apr 09, 2018 at 09:31:56AM +0800, Craig Ringer wrote:
> You could make the argument that it's OK to forget if the entire file
> system goes away. But actually, why is that ok?

I was going to say that it'd be okay to clear error flag on umount, since any
opened files would prevent unmounting; but, then I realized we need to consider
the case of close()ing all FDs then opening them later..in another process.

I was going to say that's fine for postgres, since it chdir()s into its
basedir, but actually not fine for nondefault tablespaces..

On Mon, Apr 09, 2018 at 02:54:16PM +0200, Anthony Iliopoulos wrote:
> notification descriptor open, where the kernel would inject events
> related to writeback failures of files under watch (potentially
> enriched to contain info regarding the exact failed pages and
> the file offset they map to).

For postgres that'd require backend processes to open() an file such that,
following its close(), any writeback errors are "signalled" to the checkpointer


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