[Libguestfs] [libnbd PATCH 0/3] opt_list_meta_context

[Eric Blake]

On 9/29/20 6:23 AM, Richard W.M. Jones wrote:
> This is not related to the current patch, but generally for libnbd:
> 
> (1) Should we be testing interop separately for qemu-storage-daemon
> (qsd), or is qsd basically qemu-nbd in a new wrapper so it's not worth
> doing it?
> 
> (2) I found a bug in the new nbdinfo behaviour:
> 
> $ nbdkit -fv file dir=/scratch
> 
> (where /scratch is a directory with a lot of files in it)
> 
> $ nbdinfo --version
> libnbd 1.5.3
> $ nbdinfo --list nbd://localhost
> [... lots of files shown ...]
> nbd_opt_info: recv: Connection reset by peer
> 
> nbdkit gives this error:
> 
> nbdkit: file[1]: error: client exceeded maximum number of options (32)

Yeah, we really ought to raise nbdkit's limits when .list_exports 
returns a large list.  We haven't yet released nbdkit 1.24 where the 
file driver actually has a large .list_exports; but it may also be a 
reason to figure out if libnbd should go to the effort of re-connecting 
for the later portion of a list on servers like older nbdkit that limit 
the length of the negotiation phase.

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3226
Virtualization:  qemu.org | libvirt.org