[pve-devel] [PATCH qemu-server 02/14] blockdev: cmdline: convert drive to blockdev syntax

[Fabian Grünbichler]

> Fiona Ebner <f.ebner at proxmox.com> hat am 06.05.2025 14:57 CEST geschrieben:
> > +
> > +	($storeid) = PVE::Storage::parse_volume_id($volid, 1);
> > +	my $vtype = $storeid ? (PVE::Storage::parse_volname($storecfg, $drive->{file}))[0] : undef;
> > +	die "$driveid: explicit media parameter is required for iso images\n"
> > +	    if !defined($drive->{media}) && defined($vtype) && $vtype eq 'iso';
> > +
> > +	if (drive_is_cdrom($drive)) {
> > +	    $path = get_iso_path($storecfg, $volid);
> > +	} elsif ($storeid) {
> > +	    $path = PVE::Storage::path($storecfg, $volid, $snap);
> > +	    $scfg = PVE::Storage::storage_config($storecfg, $storeid);
> > +	}
> > +    }
> > +
> > +    if ($path =~ m/^rbd:(\S+)$/) {
> > +
> > +        my $rbd_options = $1;
> > +        $blockdev->{driver} = 'rbd';
> > +
> > +	#map options to key=value pair (if not key is provided, this is the image)
> > +	#options are seprated with : but we need to exclude \: used for ipv6 address
> > +	my $options = {
> > +	    map {
> > +		s/\\:/:/g; /^(.*?)=(.*)/ ? ($1=>$2) : (image=>$_)
> > +	    } $rbd_options =~ /(?:\\:|\[[^\]]*\]|[^:\\])+/g
> > +	};
> 
> Maybe we should add a new method to the storage plugin API to give us a
> hash with the necessary QEMU blockdev options? Because right now, we
> construct an implicit QEMU-path just to deconstruct it again, which is
> not nice at all. We can implement that for all our plugins and, for
> backwards-compatibility handling with third-party plugins, the default
> implementation in Plugin.pm could have the code you put here.

something like that sounds okay to me..

> Just not sure if the RBD plugin should put the generated ceph config in
> /run/qemu-server/${storeid}.ceph.conf then, or use some kind of
> /run/pve-storage path?

the latter seems like a better fit if the storage plugin generates the
file..

> CC @Fabian, opinions?

do we need both? or could a per-volume config file also replace the hash?