Re: status of block-integrity

[Martin K. Petersen]

>>>>> "Christoph" == Christoph Hellwig <hch@xxxxxxxxxxxxx> writes:

Christoph> We have the block integrity code to support DIF/DIX in the
Christoph> the tree for about 5 and a half years, and we still don't
Christoph> have a single consumer of it.  

What do you mean? If you have a DIX-capable HBA (lpfc, qla2xxx, zfcp)
then integrity protection is active from the block layer down. The only
code that's not currently being exercised are the tag interleaving
functions.  I was hoping the FS people would use them for back pointers
but nobody seemed to bite.


Christoph> Given that we'll have a lot of work to do in this area with
Christoph> block multiqueue I think it's time to either kill it off for
Christoph> good or make sure we can actually use and test it.

I don't understand why multiqueue would require a lot of work? It's just
an extra scatterlist per request.

And obviously, if there's anything that needs to be done in this area
I'll be happy to do so...

-- 
Martin K. Petersen	Oracle Linux Engineering

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