[libvirt] [PATCHv2 08/62] qemu: hotplug: consolidate media change code paths

[Peter Krempa]

Use qemuDomainAttachDeviceDiskLive to change the media in
qemuDomainChangeDiskLive as the former function already does all the
necessary steps to prepare the new medium.

This also allows us to turn qemuDomainChangeEjectableMedia static.

Signed-off-by: Peter Krempa <pkrempa at redhat.com>
---
 src/qemu/qemu_driver.c  | 18 ++----------------
 src/qemu/qemu_hotplug.c | 18 +++++++++++++++---
 src/qemu/qemu_hotplug.h |  9 ++-------
 tests/qemuhotplugtest.c |  2 +-
 4 files changed, 20 insertions(+), 27 deletions(-)

diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 4fc1e358fa..15ec92bf10 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -7599,7 +7599,7 @@ qemuDomainAttachDeviceLive(virDomainObjPtr vm,
     switch ((virDomainDeviceType)dev->type) {
     case VIR_DOMAIN_DEVICE_DISK:
         qemuDomainObjCheckDiskTaint(driver, vm, dev->data.disk, NULL);
-        ret = qemuDomainAttachDeviceDiskLive(driver, vm, dev);
+        ret = qemuDomainAttachDeviceDiskLive(driver, vm, dev, false);
         if (!ret) {
             alias = dev->data.disk->info.alias;
             dev->data.disk = NULL;
@@ -7850,12 +7850,6 @@ qemuDomainChangeDiskLive(virDomainObjPtr vm,
     virDomainDeviceDef oldDev = { .type = dev->type };
     int ret = -1;

-    if (virDomainDiskTranslateSourcePool(disk) < 0)
-        goto cleanup;
-
-    if (qemuDomainDetermineDiskChain(driver, vm, disk, true) < 0)
-        goto cleanup;
-
     if (!(orig_disk = virDomainDiskFindByBusAndDst(vm->def,
                                                    disk->bus, disk->dst))) {
         virReportError(VIR_ERR_INTERNAL_ERROR,
@@ -7884,16 +7878,8 @@ qemuDomainChangeDiskLive(virDomainObjPtr vm,
             goto cleanup;
         }

-        /* Add the new disk src into shared disk hash table */
-        if (qemuAddSharedDevice(driver, dev, vm->def->name) < 0)
-            goto cleanup;
-
-        if (qemuDomainChangeEjectableMedia(driver, vm, orig_disk,
-                                           dev->data.disk->src, force) < 0) {
-            ignore_value(qemuRemoveSharedDisk(driver, dev->data.disk,
-                                              vm->def->name));
+        if (qemuDomainAttachDeviceDiskLive(driver, vm, dev, force) < 0)
             goto cleanup;
-        }

         dev->data.disk->src = NULL;
     }
diff --git a/src/qemu/qemu_hotplug.c b/src/qemu/qemu_hotplug.c
index 5b52fe9edc..c46f27f4b4 100644
--- a/src/qemu/qemu_hotplug.c
+++ b/src/qemu/qemu_hotplug.c
@@ -586,7 +586,7 @@ qemuHotplugDiskSourceRemove(qemuMonitorPtr mon,
  *
  * Returns 0 on success, -1 on error and reports libvirt error
  */
-int
+static int
 qemuDomainChangeEjectableMedia(virQEMUDriverPtr driver,
                                virDomainObjPtr vm,
                                virDomainDiskDefPtr disk,
@@ -909,10 +909,22 @@ qemuDomainAttachUSBMassStorageDevice(virQEMUDriverPtr driver,
 }


+/**
+ * qemuDomainAttachDeviceDiskLive:
+ * @driver: qemu driver struct
+ * @vm: domain object
+ * @dev: device to attach (expected type is DISK)
+ * @forceMediaChange: Forcibly open the drive if changing media
+ *
+ * Attach a new disk or in case of cdroms/floppies change the media in the drive.
+ * This function handles all the necessary steps to attach a new storage source
+ * to the VM. If @forceMediaChange is true the drive is opened forcibly.
+ */
 int
 qemuDomainAttachDeviceDiskLive(virQEMUDriverPtr driver,
                                virDomainObjPtr vm,
-                               virDomainDeviceDefPtr dev)
+                               virDomainDeviceDefPtr dev,
+                               bool forceMediaChange)
 {
     size_t i;
     virDomainDiskDefPtr disk = dev->data.disk;
@@ -946,7 +958,7 @@ qemuDomainAttachDeviceDiskLive(virQEMUDriverPtr driver,
         }

         if (qemuDomainChangeEjectableMedia(driver, vm, orig_disk,
-                                           disk->src, false) < 0)
+                                           disk->src, forceMediaChange) < 0)
             goto cleanup;

         disk->src = NULL;
diff --git a/src/qemu/qemu_hotplug.h b/src/qemu/qemu_hotplug.h
index 0297e42a98..c085c45082 100644
--- a/src/qemu/qemu_hotplug.h
+++ b/src/qemu/qemu_hotplug.h
@@ -28,12 +28,6 @@
 # include "qemu_domain.h"
 # include "domain_conf.h"

-int qemuDomainChangeEjectableMedia(virQEMUDriverPtr driver,
-                                   virDomainObjPtr vm,
-                                   virDomainDiskDefPtr disk,
-                                   virStorageSourcePtr newsrc,
-                                   bool force);
-
 void qemuDomainDelTLSObjects(virQEMUDriverPtr driver,
                              virDomainObjPtr vm,
                              qemuDomainAsyncJob asyncJob,
@@ -60,7 +54,8 @@ int qemuDomainAttachControllerDevice(virQEMUDriverPtr driver,
                                      virDomainControllerDefPtr controller);
 int qemuDomainAttachDeviceDiskLive(virQEMUDriverPtr driver,
                                    virDomainObjPtr vm,
-                                   virDomainDeviceDefPtr dev);
+                                   virDomainDeviceDefPtr dev,
+                                   bool forceMediaChange);
 int qemuDomainAttachNetDevice(virQEMUDriverPtr driver,
                               virDomainObjPtr vm,
                               virDomainNetDefPtr net);
diff --git a/tests/qemuhotplugtest.c b/tests/qemuhotplugtest.c
index 5b1e0db104..e0e248556f 100644
--- a/tests/qemuhotplugtest.c
+++ b/tests/qemuhotplugtest.c
@@ -120,7 +120,7 @@ testQemuHotplugAttach(virDomainObjPtr vm,
         /* conn in only used for storage pool and secrets lookup so as long
          * as we don't use any of them, passing NULL should be safe
          */
-        ret = qemuDomainAttachDeviceDiskLive(&driver, vm, dev);
+        ret = qemuDomainAttachDeviceDiskLive(&driver, vm, dev, false);
         break;
     case VIR_DOMAIN_DEVICE_CHR:
         ret = qemuDomainAttachChrDevice(&driver, vm, dev->data.chr);
-- 
2.16.2