[Libguestfs] [PATCH libnbd] ublk: Add new nbdublk program

[Ming Lei]

On Tue, Aug 30, 2022 at 11:29:26PM +0800, Ming Lei wrote:
> On Tue, Aug 30, 2022 at 03:38:50PM +0100, Richard W.M. Jones wrote:
> > On Tue, Aug 30, 2022 at 03:12:23PM +0800, Ming Lei wrote:
> > > The patch sent in last email may cause io hang on MQ, and follows the fixed
> > > version:
> > 
> > I split this into two commits and cleaned them up and posted them here:
> > 
> > https://gitlab.com/rwmjones/libnbd/-/commits/nbdublk/
> > 
> > Unfortunately this doesn't work for me.  When I do various filesystem
> > operations like git clone and a compile I see some subtle disk errors
> > and eventually it deadlocks, so I guess there is some problem.
> 
> OK, care to provide more details about the reproducer? Like how backend
> is setup, MQ/SQ is used, disk size, ...
> 
> I have cloned linux kernel source tree on nbdublk disk and built it with
> fedora 36 config for ~20min, so far so good. In my setting, backend is
> 'nbdkit file /dev/sda(virtio-scsi)', nbdublk is single queue.

BTW, now the build stops because of running out of virtio-scsi disk space,
but everything is still fine, btrfs can be umount successfully.



Thanks,
Ming