[PATCH v2 4/6] qemu: refactor out function to build scsi device qemu commandline

[Guannan Ren <gren@xxxxxxxxxx>]

---
 src/qemu/qemu_command.c | 124 +++++++++++++++++++-----------------------------
 1 file changed, 48 insertions(+), 76 deletions(-)

diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 1a6accd..aa91f57 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -4153,6 +4153,40 @@ error:
     return NULL;
 }
 
+static int
+qemuBuildSCSIDriveDevStr(int controllerModel,
+                         virDomainDiskDefPtr disk,
+                         virQEMUCapsPtr qemuCaps,
+                         virBufferPtr opt)
+{
+    if (disk->device != VIR_DOMAIN_DISK_DEVICE_LUN) {
+        if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_SCSI_CD)) {
+            if (disk->device == VIR_DOMAIN_DISK_DEVICE_CDROM)
+                virBufferAddLit(opt, "scsi-cd");
+            else
+                virBufferAddLit(opt, "scsi-hd");
+        } else {
+            virBufferAddLit(opt, "scsi-disk");
+        }
+    } else {
+        virBufferAddLit(opt, "scsi-block");
+    }
+
+
+    if (controllerModel == VIR_DOMAIN_CONTROLLER_MODEL_SCSI_LSILOGIC)
+        virBufferAsprintf(opt, ",bus=scsi%d.%d,scsi-id=%d",
+                          disk->info.addr.drive.controller,
+                          disk->info.addr.drive.bus,
+                          disk->info.addr.drive.unit);
+    else
+        virBufferAsprintf(opt, ",bus=scsi%d.0,channel=%d,scsi-id=%d,lun=%d",
+                          disk->info.addr.drive.controller,
+                          disk->info.addr.drive.bus,
+                          disk->info.addr.drive.target,
+                          disk->info.addr.drive.unit);
+    return 0;
+}
+
 char *
 qemuBuildDriveDevStr(virDomainDefPtr def,
                      virDomainDiskDefPtr disk,
@@ -4291,94 +4325,32 @@ qemuBuildDriveDevStr(virDomainDefPtr def,
         if ((qemuSetScsiControllerModel(def, qemuCaps, &controllerModel)) < 0)
             goto error;
 
-        if (controllerModel == VIR_DOMAIN_CONTROLLER_MODEL_SCSI_LSILOGIC) {
+        if (controllerModel == VIR_DOMAIN_CONTROLLER_MODEL_SCSI_LSILOGIC ||
+            controllerModel == VIR_DOMAIN_CONTROLLER_MODEL_SCSI_USB_BOT) {
             if (disk->info.addr.drive.target != 0) {
                 virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
                                _("target must be 0 for controller "
                                  "model 'lsilogic'"));
                 goto error;
             }
-
-            if (disk->device == VIR_DOMAIN_DISK_DEVICE_LUN) {
-                virBufferAddLit(&opt, "scsi-block");
-            } else {
-                if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_SCSI_CD)) {
-                    if (disk->device == VIR_DOMAIN_DISK_DEVICE_CDROM)
-                        virBufferAddLit(&opt, "scsi-cd");
-                    else
-                        virBufferAddLit(&opt, "scsi-hd");
-                } else {
-                    virBufferAddLit(&opt, "scsi-disk");
-                }
-            }
-
-            virBufferAsprintf(&opt, ",bus=scsi%d.%d,scsi-id=%d",
-                              disk->info.addr.drive.controller,
-                              disk->info.addr.drive.bus,
-                              disk->info.addr.drive.unit);
-        } else if (controllerModel == VIR_DOMAIN_CONTROLLER_MODEL_SCSI_USB_BOT) {
-            if (disk->info.addr.drive.target != 0) {
+        } else if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_SCSI_DISK_CHANNEL)) {
+            if (disk->info.addr.drive.target > 7) {
                 virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
-                               _("target must be 0 for controller "
-                                 "model 'usb-bot'"));
+                               _("This QEMU doesn't support target "
+                                 "greater than 7"));
                 goto error;
             }
 
-            if (disk->device != VIR_DOMAIN_DISK_DEVICE_LUN) {
-                if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_SCSI_CD)) {
-                    if (disk->device == VIR_DOMAIN_DISK_DEVICE_CDROM)
-                        virBufferAddLit(&opt, "scsi-cd");
-                    else
-                        virBufferAddLit(&opt, "scsi-hd");
-                } else {
-                    virBufferAddLit(&opt, "scsi-disk");
-                }
-            } else {
-                virBufferAddLit(&opt, "scsi-block");
-            }
-
-            virBufferAsprintf(&opt, ",bus=scsi%d.0,channel=%d,scsi-id=%d,lun=%d",
-                              disk->info.addr.drive.controller,
-                              disk->info.addr.drive.bus,
-                              disk->info.addr.drive.target,
-                              disk->info.addr.drive.unit);
-        } else {
-            if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_SCSI_DISK_CHANNEL)) {
-                if (disk->info.addr.drive.target > 7) {
-                    virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
-                                   _("This QEMU doesn't support target "
-                                     "greater than 7"));
-                    goto error;
-                }
-
-                if ((disk->info.addr.drive.bus != disk->info.addr.drive.unit) &&
-                    (disk->info.addr.drive.bus != 0)) {
-                    virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
-                                   _("This QEMU only supports both bus and "
-                                     "unit equal to 0"));
-                    goto error;
-                }
-            }
-
-            if (disk->device != VIR_DOMAIN_DISK_DEVICE_LUN) {
-                if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_SCSI_CD)) {
-                    if (disk->device == VIR_DOMAIN_DISK_DEVICE_CDROM)
-                        virBufferAddLit(&opt, "scsi-cd");
-                    else
-                        virBufferAddLit(&opt, "scsi-hd");
-                } else {
-                    virBufferAddLit(&opt, "scsi-disk");
-                }
-            } else {
-                virBufferAddLit(&opt, "scsi-block");
+            if ((disk->info.addr.drive.bus != disk->info.addr.drive.unit) &&
+                (disk->info.addr.drive.bus != 0)) {
+                virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                               _("This QEMU only supports both bus and "
+                                 "unit equal to 0"));
+                goto error;
             }
-
-            virBufferAsprintf(&opt, ",bus=scsi%d.0,channel=%d,scsi-id=%d,lun=%d",
-                              disk->info.addr.drive.controller,
-                              disk->info.addr.drive.bus,
-                              disk->info.addr.drive.target,
-                              disk->info.addr.drive.unit);
         }
+
+        qemuBuildSCSIDriveDevStr(controllerModel, disk, qemuCaps, &opt);
         break;
     case VIR_DOMAIN_DISK_BUS_SATA:
         if (disk->info.addr.drive.bus != 0) {
-- 
1.8.3.1

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