userspace block driver?

[Jeff Garzik]

Has anybody put any thought towards how a userspace block driver would work?

Consider a block device implemented via an SSL network connection.  I 
don't want to put SSL in the kernel, which means the only other 
alternative is to pass data to/from a userspace daemon.

Anybody have any favorite methods?  [similar to] mmap'd packet socket? 
ramfs?

TIA,

	Jeff





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