[libvirt] [PATCH 2/2] conf: Validate disk lun using correct types

[John Ferlan]

https://bugzilla.redhat.com/show_bug.cgi?id=1201143

The formatdomain.html.in description for <disk> device 'lun' indicates that
it must be either a type 'block' or type 'network' with protocol 'iscsi';
however, we did not make that check until domain startup.

This caused issues for virt-manager which had an unexpected failure at
run time rather config time.

This patch adds a check in post part disk device checking for the specific
and supported lun types as well as adjusting the test failure to be for
parse config rather than run time.

Signed-off-by: John Ferlan <jferlan at redhat.com>
---
 src/conf/domain_conf.c   | 22 ++++++++++++++++++++++
 tests/qemuxml2argvtest.c |  2 +-
 2 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 2c3b96b..211aa9f 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -3893,6 +3893,28 @@ virDomainDeviceDefPostParseInternal(virDomainDeviceDefPtr dev,
                 return -1;
             }
         }
+
+        /* Validate LUN configuration
+         * NOTE: virStorageTranslateDiskSourcePool is not run yet, so for
+         *       disk "volume"'s, the closest we can get at config time is
+         *       to ensure mode isn't direct since host/default will allow
+         *       lun/block usage. At run time if it's determined the wrong
+         *       voltype and pooltype values are set, then failure occurs
+         */
+        if (disk->device == VIR_DOMAIN_DISK_DEVICE_LUN &&
+            !(disk->src->type == VIR_STORAGE_TYPE_BLOCK ||
+              (disk->src->type == VIR_STORAGE_TYPE_NETWORK &&
+               disk->src->protocol == VIR_STORAGE_NET_PROTOCOL_ISCSI) ||
+              (disk->src->type == VIR_STORAGE_TYPE_VOLUME &&
+               disk->src->srcpool &&
+               disk->src->srcpool->mode !=
+               VIR_STORAGE_SOURCE_POOL_MODE_DIRECT))) {
+            virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+                           _("disk '%s' improperly configured to be a "
+                             "device='lun'"),
+                           disk->dst);
+            return -1;
+        }
     }
 
     if (dev->type == VIR_DOMAIN_DEVICE_VIDEO) {
diff --git a/tests/qemuxml2argvtest.c b/tests/qemuxml2argvtest.c
index a212d30..43c2769 100644
--- a/tests/qemuxml2argvtest.c
+++ b/tests/qemuxml2argvtest.c
@@ -818,7 +818,7 @@ mymain(void)
                     QEMU_CAPS_DRIVE, QEMU_CAPS_DRIVE_FORMAT);
     DO_TEST("disk-drive-no-boot",
             QEMU_CAPS_DRIVE, QEMU_CAPS_DEVICE, QEMU_CAPS_BOOTINDEX);
-    DO_TEST_FAILURE("disk-device-lun-type-invalid",
+    DO_TEST_PARSE_ERROR("disk-device-lun-type-invalid",
                     QEMU_CAPS_DRIVE, QEMU_CAPS_DEVICE, QEMU_CAPS_VIRTIO_SCSI);
     DO_TEST("disk-usb",  NONE);
     DO_TEST("disk-usb-device",
-- 
2.1.0