Re: Transparent compression in the FS

[Andrea Arcangeli]

On Thu, Oct 16, 2003 at 01:10:20PM -0400, Jeff Garzik wrote:
> As Andre H and Larry McVoy love to point out, data isn't _really_ secure 
> until it's been checksummed, and that checksum data is verified on 
> reads.  LM has an anecdote (doesn't he always?  <g>) about how BitKeeper 
> -- which checksums its data inside the app -- has found data-corrupting 
> kernel bugs, in days long past.

yes, even a fs checksum won't protect against kernel bugs randomly
corrupting pagacache, and that's why having it in userspace is
preferable IMHO (though in userspace it's more difficult to switch it
off transparently unless the app is designed for that).
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