[PATCH] drive: use the storage daemon for a tpmstate on rbd with krbd disabled

["Davíð Steinn Geirsson" <david@dsg.is>]

With a Ceph cluster where min-compat-client is too new for krbd, vTPM
fails if its image is stored on rbd with:

  rbd: sysfs write failed
  libceph: RADOS feature set mismatch: server's required > my supported

Fix by using the FUSE path when krbd is disabled for the storage.

Signed-off-by: Davíð Steinn Geirsson <david@dsg.is>
---
 src/PVE/QemuServer/Drive.pm | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/PVE/QemuServer/Drive.pm b/src/PVE/QemuServer/Drive.pm
index 0b57371..d6e4b3e 100644
--- a/src/PVE/QemuServer/Drive.pm
+++ b/src/PVE/QemuServer/Drive.pm
@@ -1227,6 +1227,12 @@ sub drive_uses_qsd_fuse {
         my $path = PVE::Storage::path($storecfg, $drive->{file});
         return 1 if $path =~ m!^iscsi://!;
 
+        # The RBD plugin maps a volume with the kernel client, which may not
+        # speak the cluster's feature set; with krbd disabled, reach the
+        # volume through librbd like every other drive.
+        my $scfg = PVE::Storage::storage_config($storecfg, $storeid);
+        return 1 if $scfg->{type} eq 'rbd' && !$scfg->{krbd};
+
         my $format = checked_volume_format($storecfg, $drive->{file});
         return $format ne 'raw';
     }
-- 
2.55.0