[libvirt] [PATCH 06/10] qemu: hotplug: Reuse qemuHotplugDiskSourceRemove for disk backend removal

[Peter Krempa]

Add code which will convert a disk definition into
qemuHotplugDiskSourceData and then reuse qemuHotplugDiskSourceRemove to
remove all the backend related objects.

This unifies the detach code as much as possible with the already
existing helpers and will allow reuse this infrastructure when changing
removable disk media.

Signed-off-by: Peter Krempa <pkrempa at redhat.com>
---
 src/qemu/qemu_hotplug.c | 129 +++++++++++++++++++++++++++++++++++-------------
 1 file changed, 94 insertions(+), 35 deletions(-)

diff --git a/src/qemu/qemu_hotplug.c b/src/qemu/qemu_hotplug.c
index f1b18fcc7d..3ee74c8e40 100644
--- a/src/qemu/qemu_hotplug.c
+++ b/src/qemu/qemu_hotplug.c
@@ -373,6 +373,96 @@ qemuHotplugDiskSourceDataFree(qemuHotplugDiskSourceDataPtr data)
 }


+/**
+ * qemuDomainRemoveDiskStorageSourcePrepareData:
+ * @src: disk source structure
+ * @driveAlias: Alias of the -drive backend, the pointer is always consumed
+ *
+ * Prepare qemuBlockStorageSourceAttachDataPtr for detaching a single source
+ * from a VM. If @driveAlias is NULL -blockdev is assumed.
+ */
+static qemuBlockStorageSourceAttachDataPtr
+qemuHotplugRemoveStorageSourcePrepareData(virStorageSourcePtr src,
+                                          char *driveAlias)
+
+{
+    qemuDomainStorageSourcePrivatePtr srcpriv = QEMU_DOMAIN_STORAGE_SOURCE_PRIVATE(src);
+    qemuBlockStorageSourceAttachDataPtr data;
+    qemuBlockStorageSourceAttachDataPtr ret = NULL;
+
+    if (VIR_ALLOC(data) < 0)
+        goto cleanup;
+
+    if (driveAlias) {
+        VIR_STEAL_PTR(data->driveAlias, driveAlias);
+        data->driveAdded = true;
+    } else {
+        data->formatNodeName = src->nodeformat;
+        data->formatAttached = true;
+        data->storageNodeName = src->nodestorage;
+        data->storageAttached = true;
+    }
+
+    if (src->pr &&
+        !virStoragePRDefIsManaged(src->pr) &&
+        VIR_STRDUP(data->prmgrAlias, src->pr->mgralias) < 0)
+        goto cleanup;
+
+    if (VIR_STRDUP(data->tlsAlias, src->tlsAlias) < 0)
+        goto cleanup;
+
+    if (srcpriv) {
+        if (srcpriv->secinfo &&
+            srcpriv->secinfo->type == VIR_DOMAIN_SECRET_INFO_TYPE_AES &&
+            VIR_STRDUP(data->authsecretAlias, srcpriv->secinfo->s.aes.alias) < 0)
+            goto cleanup;
+
+        if (srcpriv->encinfo &&
+            srcpriv->encinfo->type == VIR_DOMAIN_SECRET_INFO_TYPE_AES &&
+            VIR_STRDUP(data->encryptsecretAlias, srcpriv->encinfo->s.aes.alias) < 0)
+            goto cleanup;
+    }
+
+    VIR_STEAL_PTR(ret, data);
+
+ cleanup:
+    VIR_FREE(driveAlias);
+    qemuBlockStorageSourceAttachDataFree(data);
+    return ret;
+}
+
+
+static qemuHotplugDiskSourceDataPtr
+qemuHotplugDiskSourceRemovePrepare(virDomainDiskDefPtr disk,
+                                   virQEMUCapsPtr qemuCaps ATTRIBUTE_UNUSED)
+{
+    qemuBlockStorageSourceAttachDataPtr backend;
+    qemuHotplugDiskSourceDataPtr data;
+    qemuHotplugDiskSourceDataPtr ret = NULL;
+    char *drivealias = NULL;
+
+    if (VIR_ALLOC(data) < 0)
+        return NULL;
+
+    if (!(drivealias = qemuAliasDiskDriveFromDisk(disk)))
+        goto cleanup;
+
+    if (!(backend = qemuHotplugRemoveStorageSourcePrepareData(disk->src,
+                                                              drivealias)))
+        goto cleanup;
+
+    if (VIR_APPEND_ELEMENT(data->backends, data->nbackends, backend) < 0)
+        goto cleanup;
+
+    VIR_STEAL_PTR(ret, data);
+
+ cleanup:
+    qemuBlockStorageSourceAttachDataFree(backend);
+    qemuHotplugDiskSourceDataFree(data);
+    return ret;
+}
+
+
 /**
  * qemuHotplugDiskSourceAttachPrepare:
  * @disk: disk to generate attachment data for
@@ -3853,36 +3943,21 @@ qemuDomainRemoveDiskDevice(virQEMUDriverPtr driver,
                            virDomainObjPtr vm,
                            virDomainDiskDefPtr disk)
 {
-    qemuDomainStorageSourcePrivatePtr diskPriv = QEMU_DOMAIN_STORAGE_SOURCE_PRIVATE(disk->src);
+    qemuHotplugDiskSourceDataPtr diskbackend = NULL;
     virDomainDeviceDef dev;
     virObjectEventPtr event;
     size_t i;
     qemuDomainObjPrivatePtr priv = vm->privateData;
-    char *drivestr;
     bool prManaged = priv->prDaemonRunning;
     bool prUsed = false;
-    const char *authAlias = NULL;
-    const char *encAlias = NULL;
     int ret = -1;

     VIR_DEBUG("Removing disk %s from domain %p %s",
               disk->info.alias, vm, vm->def->name);

-    /* build the actual drive id string as the disk->info.alias doesn't
-     * contain the QEMU_DRIVE_HOST_PREFIX that is passed to qemu */
-    if (!(drivestr = qemuAliasDiskDriveFromDisk(disk)))
+    if (!(diskbackend = qemuHotplugDiskSourceRemovePrepare(disk, priv->qemuCaps)))
         return -1;

-    if (diskPriv) {
-        if (diskPriv->secinfo &&
-            diskPriv->secinfo->type == VIR_DOMAIN_SECRET_INFO_TYPE_AES)
-            authAlias = diskPriv->secinfo->s.aes.alias;
-
-        if (diskPriv->encinfo &&
-            diskPriv->encinfo->type == VIR_DOMAIN_SECRET_INFO_TYPE_AES)
-            encAlias = diskPriv->encinfo->s.aes.alias;
-    }
-
     for (i = 0; i < vm->def->ndisks; i++) {
         if (vm->def->disks[i] == disk) {
             virDomainDiskRemove(vm->def, i);
@@ -3895,24 +3970,7 @@ qemuDomainRemoveDiskDevice(virQEMUDriverPtr driver,

     qemuDomainObjEnterMonitor(driver, vm);

-    qemuMonitorDriveDel(priv->mon, drivestr);
-    VIR_FREE(drivestr);
-
-    /* If it fails, then so be it - it was a best shot */
-    if (authAlias)
-        ignore_value(qemuMonitorDelObject(priv->mon, authAlias));
-
-    /* If it fails, then so be it - it was a best shot */
-    if (encAlias)
-        ignore_value(qemuMonitorDelObject(priv->mon, encAlias));
-
-    /* If it fails, then so be it - it was a best shot */
-    if (disk->src->pr &&
-        !virStoragePRDefIsManaged(disk->src->pr))
-        ignore_value(qemuMonitorDelObject(priv->mon, disk->src->pr->mgralias));
-
-    if (disk->src->tlsAlias)
-        ignore_value(qemuMonitorDelObject(priv->mon, disk->src->tlsAlias));
+    qemuHotplugDiskSourceRemove(priv->mon, diskbackend);

     if (prManaged && !prUsed)
         ignore_value(qemuMonitorDelObject(priv->mon, qemuDomainGetManagedPRAlias()));
@@ -3941,6 +3999,7 @@ qemuDomainRemoveDiskDevice(virQEMUDriverPtr driver,
     ret = 0;

  cleanup:
+    qemuHotplugDiskSourceDataFree(diskbackend);
     virDomainDiskDefFree(disk);
     return ret;
 }
-- 
2.16.2