Messages in this thread | | | Date | Wed, 09 Nov 2005 03:01:42 -0500 | From | Jeff Garzik <> | Subject | Re: userspace block driver? |
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Jens Axboe wrote: > On Wed, Nov 09 2005, Jeff Garzik wrote: > >>Neil Brown wrote: >> >>>On Wednesday November 9, jgarzik@pobox.com wrote: >>> >>> >>>>Has anybody put any thought towards how a userspace block driver >>>>would work? >>> >>> >>>Isn't this was enbd does? >>> http://www.it.uc3m.es/~ptb/nbd/ >> >>Is there something there relevant for modern kernels? I would sure hope >>I could come up with something more lightweight than that. > > > I was going to say drbd, but then you did say more lightweight :-) > > Is nbd completely screwed these days?
nbd does more than I want.
_All_ that is needed is flipping requests <somehow> to/from userspace. nbd messes directly with sockets and such, which I don't want. It does way too much, hardcodes way too much.
loop is a closer model to a generic userspace block device than nbd, I think.
Though, answering your question directly, I do get the impression that in-kernel nbd has been left behind in favor of drbd and enbd, out in the few places where nbd-ish solutions are used.
Jeff
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