Re: Online enabling of checksums

Hi,

On Sat, Mar 03, 2018 at 07:23:31PM +0100, Magnus Hagander wrote:
> diff --git a/src/bin/pg_verify_checksums/pg_verify_checksums.c b/src/bin/pg_verify_checksums/pg_verify_checksums.c
> new file mode 100644
> index 0000000000..a4bfe7284d
> --- /dev/null
> +++ b/src/bin/pg_verify_checksums/pg_verify_checksums.c
> @@ -0,0 +1,308 @@
[...]

> +/*
> + * pg_verify_checksums
> + *
> + * Verifies page level checksums in an offline cluster
> + *
> + *	Copyright (c) 2010-2018, PostgreSQL Global Development Group

Weird copyright statement for a new file, did you base it off another
one, or just copy-pasted the boilerplate?

[...]

> +		csum = pg_checksum_page(buf, blockno + segmentno*RELSEG_SIZE);
> +		if (csum != header->pd_checksum)
> +		{
> +			if (ControlFile->data_checksum_version == PG_DATA_CHECKSUM_VERSION)
> +				fprintf(stderr, _("%s: %s, block %d, invalid checksum in file %X, calculated %X\n"),
> +						progname, fn, blockno, header->pd_checksum, csum);

The error message sounds a bit strange to me, I would expect the
filename after "in file [...]", but you print the expected checksum.
Also, 'invalid' sounds  a bit like we found something which is malformed
checksum (no hex), so maybe "checksum mismatch in file, expected %X,
found %X" or something?


Michael

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