Re: userspace block driver?

Guennadi Liakhovetski
2005-11-12T23:41:38Z

> On Wed, 9 Nov 2005, Jeff Garzik wrote:
>
> >
> > 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?

Hm, how about a simple trick:

you write a "remote resource access" filesystem and do

mount -t remote_resourse -o access_control.conf 192.168.1.1 /mnt/server1

then you "just" write a library to overload open, close, read, write,
ioctl,... do

export LD_PRELOAD=remote_libc.so

and then

mount /mnt/server1/hda1 /usr/local

In /mnt/server1/ you could have interesting things like

mouse0
dsp0

or even

network0
node0/cpu0
node0/ram0

Simple, sin't it?:-)

Thanks
Guennadi
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Guennadi Liakhovetski