Re: [PATCH 3/3] mm: Swap checksum

[Avi Kivity]

On 05/24/2010 10:32 AM, Nick Piggin wrote:
> I wonder, though. If we no longer trust block devices to give the
> correct data back, should we provide a meta block device to do error
> detection?

Some block devices do provide space for end-to-end checksums.  For the 
ones that don't, I see no efficient way of adding it (either we turn one 
access into two, or we have a non-power-of-two block size).

> No production filesystem on Linux has checksums (well, ext4
> has a few). Of the ones that add checksumming, I'd say most will not do
> data checksumming (and for direct IO it is not done).
>    

I believe btrfs checksums direct IO.  Unfortunately it has some way to 
go before it can be used in production.

--
Do not meddle in the internals of kernels, for they are subtle and quick to panic.

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