Re: Block-level CRC checks

Alvaro Herrera <alvherre@commandprompt.com> writes:
> The implementation I'm envisioning requires the use of a new relation
> fork to store the per-block CRCs.

That seems bizarre, and expensive, and if you lose one block of the CRC
fork you lose confidence in a LOT of data.  Why not keep the CRCs in the
page headers?

> A buffer's io_in_progress lock protects the buffer's CRC.

Unfortunately, it doesn't.  See hint bits.
        regards, tom lane