Re: [Qemu-devel] [PATCH v4 0/6] Efficient VM backup for qemu

[Dietmar Maurer]

> >> unix sockets works with qemu nbd code?
> >
> > Sure.  nbd+unix:///exportname?socket=path is the new URI syntax, I
> > honestly forgot the old one.  SCM_CREDENTIALS checks (qemu-nbd --pid
> > or something like that) is not supported, but patches would be very welcome.
> 
> Yes, this is better than my tcp suggestion.

I tried to use named exports, but get the following when I try to connect to 
the nbd server:

nbd.c:nbd_receive_negotiate():L452: Receiving negotiation. name = ide0
nbd.c:nbd_receive_negotiate():L476: Magic is NBDMAGIC
nbd.c:nbd_receive_negotiate():L488: Magic is 0x420281861253
nbd.c:nbd_receive_negotiate():L495: Checking magic (opts_magic)
nbd.c:nbd_receive_negotiate():L497: Bad magic received


Seems the server sends NBD_CLIENT_MAGIC, but the c lient expects NBD_OPTS_MAGIC?